I've been out of things for a while so I'm looking to put together a new computer and audio/midi interface. 
I've used M-audio audiophile PCI card for years but what is the recommended type of interface now since PCI is becoming obsolete? Is it USB, Firewire, PCI express or what?
Any ideas appreciated 

http://www.cakewalk.com/Support/Knowledge-Base/2005273/What-audio-hardware-do-I-need
 
This is a helpful link from Cakewalk.

USB is probably best for long term.
 
I'm enjoying the Tascam uh-7000 in for evaluation at the moment.  Nice bit of kit.  I haven't messed w/ it much, but the DA is a semi step above my normal TC Konnekt, which has very good DA. 
 
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Generally good info in that article, but it hasn't been updated for three years.
There are still some very high end PCI cards available, but for more reasonably priced units that offer good performance, USB is probably the way to go. Stick with USB2(or 3). There are some USB1 products available (Lexicon in particular). They are very cheap because they are based on very old technology, and basically, they suck.
Firewire seems to be falling out of favor as well.
Per the article, consider your I/O requirements.
The Focusrite Scarlet series ate a popular choice, but I went with this because it offers some unique capabilities in its price range:
http://www.sweetwater.com/store/detail/EIEPro/
It has proven to  be everything I hoped for.

If you usually just record one or two tracks at the same time but like to have the opportunity to record multi-miked drums on occasion, I'd recommend getting an interface with ADAT expandability! 
 
I use the RME Babyface (USB) which is small and convenient and just great for my home studio needs. Then I got the very cheap Behringer ADA 8000 8-channel preamp/ADC which is connected via toslink. That way I can record 10 analog sources simultaneously! 
 
Sven

What about the Roland Studio something? Lots of channels and options? Is it good enough for pro recording?

So it seems like going USB is what most here recommend. I really only need two inputs plus midi in and out since I only record myself, guitar and voice live. Everything else, keyboards, drums, etc., I use midi. I have a Mackie 1402 vlz that I use with my Maudio Audiophile 2496 now and it does everything I need but it's PCI. Since most of the new motherboards are doing away with PCI I figure it's time to find out what's happening in the new millenium. Thanks for all the replies.   

garyed
So it seems like going USB is what most here recommend. I really only need two inputs plus midi in and out since I only record myself, guitar and voice live. Everything else, keyboards, drums, etc., I use midi. I have a Mackie 1402 vlz that I use with my Maudio Audiophile 2496 now and it does everything I need but it's PCI. Since most of the new motherboards are doing away with PCI I figure it's time to find out what's happening in the new millenium. Thanks for all the replies.   

Hi Gary,
I had the similar requirements as you do for an interface and I went with what a lot of Sonar users recommended:
Focusrite's_Scarlett_2i4. (check Audio Deluxe, JRR Shop, and Sweetwater as they might be able to offer additional discounts).
 
I'm extremely happy with it and most importantly, the driver + customer support is excellent with Focusrite.
 
Specifications

• 2 in / 4 out USB audio interface
• 96 KHz, 24-bit conversion
• 2 Focusrite microphone preamplifiers
• Red anodised aluminium unibody chassis

Front panel

• 2 line/mic/instrument combination inputs - high quality XLR/ ¼ “ TRS Jack Combo
• 2 line/inst switches
• 2 illuminating “PAD” buttons
• 2 Gain knobs
• 2 Gain halo signal indicators
• 48V Phantom power switch
• MIDI activity LED indicator
• USB connection LED indicator
• “DIRECT MONITOR” control
• “STEREO/MONO” switch for direct monitor
• Large monitor level dial (controls headphone and line level outputs)
• Headphone output - ¼” TRS Jack
• Headphone level knob
• “HEADPHONE SOURCE” switch

Rear panel

• 2 balanced monitor outputs – TRS (channels 1-2)
• 4 unbalanced outputs – RCA Phono (channels 1-4)
• MIDI IO
• USB 2.0 Port
• Kensington Lock slot

RME Fireface UFX (either USB or Firewire).

Thanks Mesh,
 
I was thinking about Maudio's Mtrack Plus but the Scarlett 2i4 looks a little nicer at 24/96 when the Mtrack is 24/48. The Mtrack does have spdif IO but I've never used it on my Audiophile so that's not a big deal. Maudio does have good drivers which may be a factor because I'm trying to do a DAW for both Windows & Linux. I use Cakewalk for Windows but I haven't decided what I'm going to use in Linux. I love Cakewalk but I don't like Windows. I've been using Cakewalk for about 25 years from when it was only midi for DOS. I've been through a lot of upgrades & enjoyed them all but i can't say the same for Windows. 

 That was my upgraded disk version. I think I started with version 2.0 or 3.0.