I'll second Martymilton's comment above. I own a pair of Monitor 5 v.3 (little brother of the Studio 40; this configuration no longer exists in the v.5 lineup) and a pair of Cinema 70 v.3 (little brother of the new Atom Monitor).
I'd highly recommend anything in Paradigm's Monitor lineup, including the new Atom Monitor, with a sweet spot at the Mini. Your budget and space requirements should be the driving forces, as the sound will be quite similar throughout the lineup (detailed high / mid presentation, and additional bass extension as you go up). My Monitor 5's are now hooked up to equipment worth more than 6 times what I paid for the speakers at retail (found almost all of it used, didn't plan it that way
) and their performance is still scaling with each upgrade.
Audio Jester: if you are talking about the new Atom Monitors, I would worry more about the amp's specs than its power rating. Buy Harman Kardon, NAD, Onkyo, Denon, etc. and you get the watts you pay for; stay away from Best Buy and any amp that rates its power with one channel driven at 1 kHz.
The new Atom Monitors are more sensitive than previous Paradigm offerings, and really any amp will drive them fine. I have my Monitor 5's hooked up to 400 biamped RMS watts and they sound fantastic, so more can be better, but I have to be careful about where I set that volume knob and the improvement is rather slight... On the flip side, my Marantz 2230 (with only 30 watts per channel) drives them at close to the same level. With sensitive speakers, you can go quality rather than pure arc-welding power.