Monitor question, FW, surrounds, sub.

Subdusted
Subdusted Posts: 30
I have a 9.2 Integra 70.1 AVR and in the middle of building my HT. Monitors seemed like an obvious choice price/quality wise. I have a CS2, M30s for rear surrounds, will be getting M70s for fronts..Here's the question - I want to use floor standers for front wides and surrounds. M50s would do great for both but I couldn't pass the 219.99 shipped deal on M60s and got a pair of those. M50s are coming this week. Aesthetically M60s would look better for FWs than M50s.. But what about sound ? What position will be more beneficial ? I know, the best way is to try both and compare but.. won't really be able to do it side by side, especially if I have to re-run Multi EQ XT calibration.
And a second question. I was looking for some used towers for my Zone 2 ( kitchen ).. Stumbled upon RT800s and PSW150 sub local ad , all three in nice condition for 120.00. )))
When I hooked these towers to a receiver in direct mode and watched "Black Hawk Down" they totally blew me away, it's almost a sin to put them in the kitchen. The question is about the sub though...Will it perform adequately with my Monitors? I would hate to spend 200 bucks on PSW505 when I already have this one and there's not much difference btw the two. But that's another story if there's a noticeable difference in performance quality wise, I don't care much about the loudness, 150 is good enough for me in this respect. . And if there is, and I'll need to get a 505.... Can it be paired with a 150 that I have ? The original MSRP was higher on 150, but 505 got a ton of positive reviews, people seem to be very happy with it, esp when it works with Monitors.