Cork,
That is quite a small room almost; nearly the same dimensions as my room. My 5.1 system consists of 2 M22's, a VP150 and 2 QS8's. I have had a budget Onkyo 5.1 receiver rated at 75 X 5 channels (about $300 at the time 7 years ago) and it drove the speakers as loud as I could want in my room. A few years ago I upgraded to the Onkyo 805. The main reason was so that I could get, HDMI audio, the Audyssey MultiEQ XT and maybe I would notice a difference in the amps having more headroom. I haven't noticed much of a difference with the Audyssey in my room with my setup and having more headroom with the amp hasn't made much of a difference from what I have heard. Having HD audio (the uncompressed audio from Blu-Ray) IS something this is quite noticeable though.
The speakers that you are driving are quite efficient, not a tough load (like a 4 ohms) and you have a small room like me. I think it would be a waste of money spending too much money on a receiver. Just buy the receiver that has the features you want and are within your budget, nothing more. Having enough power should not be a problem. Also, if you spend say $1500 or $2000 on a receiver you will probably never want to upgrade it anytime in the near future, even if there is some new and cool feature that you would like to have (like height and width channels right now, for example). If you spend $300 to $600, then if there is a new feature that you really want, then it is not as much of an issue. The one thing to keep in mind though, is that you probably will not hear any difference between a $500 and $2000 receiver in your room.
