Both of these guys make very good points and give great advice.
here's what I'm running:
Yamaha RXV-2400
Bose 701 II (front) (front sub)
Bose 601 IV (rear)
Bose 301 IV (side)
Kef Q6c (centre)
Polk PSW-202 (rear sub)
Yes, most people will laugh at Bose when u tell them u have it, and I'm not going to lie to this forum so let me say I WORK FOR BOSE. I'll be the first to say I'm not big on Bose I just have it cause I don't pay what consumers pay for it. (too much)
Now, I personnally would use the 701's for your fronts, as they do sound pretty good (depending on your amp) Do not, I repeat, do not buy Bose centre channels (CACA) there are plenty of other centres out there for that price that blow BOSE way. (POLK, KEF, Paradigm, B&W)
This all depends whether you want to spend money on new frionts or not, and by that I mean, either go with the Bose or get a completely timbre matched system and make yourself happy!
Remember, this is comming from a Bose employee, so do take heed to what I'm ADVISING you, I'm not telling you what to do, in the end it's your choice and yours alone. (unless u have a wife to throw a monkey in the wrench)