I used to use Seagate drives exclusively, but a few years back, they had a massive fire and ever since then their drive quality has slipped badly, and they have also dropped their older 5-year warranty, for now only a TWO-year warranty, and I have seen quite a few go bad, when that didn't used to happen.
 
So, I moved to Western Digital - Black - which is a better-built drive, with a longer warranty.  I also now purely use a SSD for any primary drive in computers I now build, and have either a single or double additional hard drive setup - which would both be non-solid state 7,200 rpm SATA III drives, and these drives would hold sample library content, and the other would hold Cakewalk Projects.
 
Another thing to consider is picking up an AMD-based system, rather than an Intel-based one.  My primary music computer happens to have a pretty speedy i7-2600k, which is still a bit pricey even now - several years post-release of it.  I did some research last week, and it turns out that per several different benchmark studies, some of the 8-core AMD FX series CPU's are both quite speedy AND quite a bit cheaper.  AMD and Micro Center have also been selling AMD CPU's with bundled discounter motherboards, so that for a total cost of around $125-$160, you can have an AMD 8-core CPU and motherboard that supports either 32 or 64 GB of memory, AND where the CPU is actually faster than my current i7 2600k.
 
I would suggest a 750 watt or better power supply, (I use 1000 watt), and get one that is modular in nature - they allow you to only plug in the power cabling needed for the number and kind of devices present in your system.
 
My primary computer also runs 2 displays (both are HDTV's, 32" and 40"), using the on-board graphics on the motherboard.  One display uses standard VGA, and the other uses HDMI.  If I felt like it, I could swap the VGA cord for a DVI to HDMI adapter, and run an HDMI cord to the 2nd display, rather than use VGA.  Performance with these configurations is plenty fine.
 
Lots of choices - I would recommend a 240-256 GB SSD drive for your applications and OS, and either a single or double combo for additional drive(s) where they are 2 TB 7,200 ROM SATA III internal drives (I suggest Western Digital Black), and you would be smart to get a pretty big external eSATA III drive, or a giant external USB 3 backup drive - as big as 4 TB, for holding backups.
 
Bob Bone
 

He's right about tweaking the BIOS settings. However in general the defaults are perfectly fine (apart from Speedstep, and HTE). But if you want to get into serious tweaking and overclocking maybe sure go for it. But really that should not be necessary for a DAW, maybe a gamers setup. Getting an extra 5% of performance out of something that is already powerful enough is next to useless. The old days it wasn't but hardware wasn't as cheap as it is now.

There's a reason off shelf PC's has a limited BIOS functionality (although you can still get off the shelf PC's with it if you want!) that is the defaults are good enough and it protects the user from screwing with their PC's. The parameters that is supplied is generally good enough, or the BIOS auto senses the right settings.

The main thing to do is to update to the latest BIOS and chipset drivers.

Re-direct?..
 
its all very well flopping it on the table and measuring your latency :D ....but really at 800-900 Euros isn't the OP  pretty much limited to building his own?.
 
I simply see a custom PC way outside the budget for the OP (and thousands of others) so recommendations for suitable commercially available MB/BIOS would be a solid contribution to the OP and the spirit of this thread...
 
 

Mystic38
Re-direct?..
 
its all very well flopping it on the table and measuring your latency :D ....but really at 800-900 Euros isn't the OP  pretty much limited to building his own?.
 
I simply see a custom PC way outside the budget for the OP (and thousands of others) so recommendations for suitable commercially available MB/BIOS would be a solid contribution to the OP and the spirit of this thread...

Profit margins on mass produced assemblies are tiny. I've built maybe 1000+ PC's in my life (assembled them for Samsung) and used to build my own PC's until I realise it was far cheaper off the shelf, even after adding my own customisations. Plus if hardware went wrong there was a central point of contact, distributed contacts often meant suppliers blaming each other for each others hardware.

TerraSin
Here's a good link on getting started with DPC latency:
http://www.sweetwater.com...ng-dpc-latency-issues/

I have no issues on my system, I was just wondering what BIOS settings he recommends customizing. I build my own systems and as such the boards I use (an ASUS X99 Deluxe in this case) have a stupid amount of customization available. I'm just curious as to what he'd recommend changing. I don't know that I would make any changes, as I said I'm not having problems and for me stability is the most important thing, followed by gaming performance, and only then audio performance. But I'd look in to the settings and what they do and maybe test it to see what, if any, difference it makes.

Sycraft
 and for me stability is the most important thing, followed by gaming performance,

Speaking of which......you need to be on TF2 mate!! (the natives are getting restless)

http://www.tomshardware.co.uk/forum/