You won't be disappointed. I had the equivalent (RC mini CC, 4 X RC mini's) in a fairly large area (22 x 10, attached to a kitchen in an open space), and was pretty satisfied. The improvement is tangible when you go to RC-10's (V5.1 is the equivalent) and significant when you step up to towers RC-50 (V6.2 equivalent) and the RC-LCR (V 5.2 CC). I made those progressions, so I know the differences, but the V mini system will be very good for you.
If the mini's is what you can do now, the minis will do you fine as long as you choose a really good supporting sub you're compromising a good amount here, why not get a very good sub?
batpig is right (I've heard that before), avoid those subs and spend on one that will give you crisp, good bass and a good extension.
Edited by hernanu - 12/3/12 at 6:58am