Welcome Rebulx; glad to have you aboard!

I am currently using an Onkyo 602 to drive my M50s in a 16X27 room with no need(IMHO)for an additional amp.

It's my third Onkyo and I'm very happy with it, and it fits your price bracket nicely. However there are literally tons of other receivers out there that will do just fine. Simply pick the features you like and want the most! You almost can't go wrong.