Good info Anamorphic and Isiberian. I appreciate it. I don't pretend that I understand it all, but it is still helpful. I think I may have a mental block when it comes to learning the technical side of speakers and amps, etc.

Given this mental block, I think i will definitely have to rely on you (and others) as my tech translators for this decision.
So here is where I stand now... I have decided on the Atoms (the mini monitors are out of my budget unfortunately), and so now I just need to find the right receiver. While I will definitely use these for all audio sources (tuner, TV, movies, DVD, XBox, and Wii, etc.), high quality stereo music reproduction is my main goal. I may go Bluray in a year, and I could see adding a sub and/or center channel for a true HT in 2-3 years, but for a good long while the front 2 channels will be all I need or want, and the wife is on board with this plan.
While I would love to be able to afford a "great" AVR, I just don't have the spousal approval or money to make that happen. So that leaves me with trying to find a "good" receiver (not great, but not merely average either) that is well rounded for both music and HT, and has upgradability for the future. 5.1 channels is plenty for my needs. If I had to pick a reciever that was either better at music, or home theater, then I would go in favor of music (maybe a 60%-40% split in favor of music).
My original budget for a AVR is $200. I would consider going up to $225 or maybe $250 if it would get me something a lot better. But if it is just marginally better, or has an extra feature or two, then it may not be worth the extra money. I definitely don't want to settle for less and then underpower these speakers, because it defeats the whole purpose. Mainly, I just don't want to end up regretting my purchase in six months.
Considering my budget and needs, should I eliminate the Pioneers (vsx-519 & 819) form contention? And just taking into account what I need, what is the best I can do for $200-$250? Onkyo? Denon? Pioneer? As I said, I don't expect to find a $1,000 AVR for $200, I just want to spend my money wisely, and find a receiver that pairs really well sonically with my Atoms.
I'm all ears~