I use an amp (nice +$200 tube amp) with my surround devices often, though in my case I can use a USB mic with my Playstation so I use the DSS (which has less background noise than a Mixamp). I connected an amp to the Recon3D USB too.
I just sold my Q701 three days ago (was still happy with it but I had 3 AKG's), if I just had a Q701 and wanted an amp I'd buy a Project Starlight or similar from Garage1217. Or save up for something higher end.
I'll probably pick up the SoundBlaster X7 after it comes out, it'll be $350-400 when it comes out; kind of on the expensive side, but considering all the features it seems like a fair price (I can make use of most of them and replace many separate devices). The soundcards dropped about $50, but only after holding strong for several months and I don't know if $50 savings is worth waiting half a year before enjoying it. I'll probably keep my tube amp anyway as an option, rolling tubes is fun and the sound has a touch of "magic" or euphoria to it.