v1c - I think your decision to go with the M7 package was a wise one. I've found in the past that many who 'understand' M&K, find it hard to move away from them because of their strengths. And some of those who had moved away had reverted back. I've still not found any 'style' packages or hi-fi AV packages that can convey the subtle nuances that properly driven and matched M&K's can - tiny little things like the funny little noises people make inside their mouths when talking quietly as an example, as well as the usual sound effects like bullet casings bouncing on a concrete floor etc. This is all possible partly because they're a sealed design, and have a more even frequency response (no overly exaggerated mid/bass notes colouring higher frequencies), and also because they're a 'satellite' design, not having to deal with low frequencies like most speakers - so by nature their more limited bandwidth is less coloured by resonating cabinets, low standing waves, ports changing the natural frequency response etc.
Also, their panning effects are far superior to many hi-fi speaker packages because all M&K packages use exactly the same speaker for left/centre/right. The fact that the centre is THE most important speaker tends to rule most packages out!
How well they perform depends on the subwoofer. The better the sub, the sweeter, and bigger these small satellites sound. Although I'd say the M series sounds better with an SB1250, I've recommended many people to go with the extremely capable KX12, partly because it brings the cost of the package down significantly (usually by about £500/600), and also because it is capable of more than most people will ever need from a sub.
scowl - yes, the M7 package is great, but the 750's really are something else! In fact, I'd say the 750's are the best VFM M&K's, working great with LX82's and DSPZ7's. Unless you're restricted for room, I'd bypass the 950 upgrade and aim for 150's.....
garychf - a well set up demo of the M&K's is strongly recommended. I've tried to find a 'nomal' speaker package to match up to the M&K's abilities, but to no avail.