Mixer/Control Surface Advice Needed

I've had a Phonic Helixboard 18FW MkII for around 4 or 5 years and have been reasonably happy with the performance in terms of both clarity of audio and latency.  Recently it's started giving me a few problems with dry solder joints and, whilst I've repaired it a couple of times, it seems like a good excuse to upgrade my set up.
 
I also use a behringer BCF2000 controller but I'd like to be able to free up some desk space and find an integrated mixer/control surface.
 
I like the features of the Tascam DM-3200 with the Firewire interface but, at almost 900cm deep, it's just too big.  I think the new Yamaha 01v96i would give me what I need in terms of inputs but I'm not sure about it's Sonar compatibility and I'm also a little sceptical about latency on USB 2.0 as, when I've used USB interfaces in the past I really didn't get on well with them.
 
Does anyone have any experience of using this Yamaha desk with Sonar X1? Specifically regarding control surface functionality, latency and pre-amp quality.
 
I'm also open to other suggestions sub £2.5k but it would probably need to have motorised faders as I'm just too used to them now.
 
EDIT: I've actually decided to go for a rackmount solution and look forward to upgrading the control surface later.  Having read through many forum threads I'm pretty sure that a Fireface 800 with an Octamic II will give me everything I need.
My multitracking started with Tascam Mixer and and 8 track reel to reel so I think I was just clinging on to the mixer concept but I realised that I rarely, if ever, use anything on the mixer other than the preamps and trim controls when recording as everything else is done in Sonar.
 

Thanks for the response Philip.

I've been bitten a couple of times with poor quality kit and, unfortunately, some of that has been cw/roland stuff.  I'd have probably gone for the v700 solution otherwise.

With respect to firewire becoming obsolete, my only other option at the moment is PCI but that too is on it's way out.  I've always been happy with firewire transfer stability so I'm going to stick with it for the moment and , hey, I'm moving away from a mixing desk so there is some progress!!!

Anyway, I ordered the FF800 and Octamic yesterday and might have accidentally added a pair of SE Munro Eggs to the order.  Will be a couple of weeks before it all arrives so I guess I've got time to reinstall all of my acoustic treatment in the smaller room that my wife has relegated me to (I'm still not entirely sure why we needed a bigger guest bedroom but at least I got some new gear as compensation).