I prefer the M&P series as well. Ergonomically, it feels better. The SR series feel rather thin which is not always a bad thing, but I didn't like it.
I also prefer the sights on the M&P, and the aftermarket support available for it.
And here is an M&P40 for $450
http://www.budsgunshop.com/catalog/p...Stainless+15RD