Welcome,
First off, if you read the forum rules you are not allowed to discuss "wanted" or "forsale" items. Use Ebay or other sites.
Secondly, you can disregard anything you've heard on AVSforum or other sites stating that the 150 and 100 are weak. Define weak? It is simply not true, at least in my opinion.
Ok, of course you could use an M22 for a center, vertical designed orientation, and not laying down as you will sacrifice its design purpose. 3 m22's upfront would be ideal, but a 22 would also work with the 50, 60, or 80's as they are the same brand drivers.
If you go floorstanding, you may want to consider the 60's. The 50's are nice, but some describe them as being a little more laid back compared to the detailed 22's or 60's or 80's.
