That setup will sound GREAT. Admittedly, you may have to go the 6-8 months without hearing the maximum "slam" of action movies, but everybody always focuses on what's missing from their setups, and forgets what life was like before DVDs in 5.1 surround.
However, depending on your musical tastes and the size of the room, you could think about getting a sub and instead of M60s (which may need more space than you have) picking up a pair of the cheaper M40s or M22s. The M40 is warm sounding, and can fill a room without the aid of a sub. Its bass extension and overall quality is unreal for the price. It's Achilles' heel is that vocals can seem laid-back...this is a good thing if you're a big fan of pop and rock recordings, but fans of jazz or opera might prefer the M22, which sacrifices output and bass extension for bass tightness and a more open midrange. Generally, the M22 will need a sub for full-range stereo listening. Both speakers are really amazing given the price.
Either speaker compared to the M60 becomes almost a non-issue for HT use (which seems to be your primary use of the system anyway). The vocal channel is more important than the mains in surround, which are more often used for soundtrack and effects. The VP150 is as good as it gets for a center channel, and with ANY L-R pair you'd never know you were missing anything. Bass can be easily redirected to a sub, so bass extension of L-R mains is also a moot point for movie viewing. The QS4 is simply incredible...I'm still in shock at how 3-dimesional the sound filed is with quadpoles.
Whatever you decide, you'll get YEARS of enjoyment out of your system.
