since you have a PC already another way to go may be the Yamaha N8 or N12.
it comes with cubase LE
you firewire connect it to your pc, load cubase and it comes ready with templates that map the N12 to cubase.
the pre's, eq, comp, and verb are pretty darn good and you get 8 full channel strips in, plus 2 stereo tracks, plus full transport control over cubase, as well as the ability to run 2 sets of speakers off of it and also 2 headphones.
i use the N12 as my studio hub now and use it with the full version of cubase and its been great
that being said you can then also route your tracks back out thru the N12 or N8 to use the mixer's eq, comp, verb etc and offload some CPU or use it in conjunction with plugs in cubase and the hardware mixer, all in all its a very handy all in one setup
http://www.sweetwater.com/store/detail/n12/