Help choosing Power Conditioner


Completely new to this area. I would like a unit that:
a) regulates power, keeping it within the 120v range.
b) provides good and long-lasting surge protection
c) can be used with a power amp as well as preamp, and sources all together
d) Hopefully helps the audio, making it more open and dynamic without negative effects.

I need to say under about $750 used. My candidates are:
Monster HTPS7000
Monster AVS2000 (how are these two different)?
PS Audio Power Director 3.5
Blue Circle MR1200 Music Ring
Any others...
Thanks!
kck
I got a 10 amp powervar used on ebay for under 50 bucks. Has minimal transformer hum, essentially inaudible at > 3 feet away. (Did NOT purchase from Tvad!). I assume it will protect the front end pieces if lightning strikes, and that was my main reason for buying. (Also, I was able to buy a kind of cool-looking gadget-like thing that was pretty heavy, which adds to any placebo effect....so yeah, I'm happy, I think).

OK, seriously--I was unable to hear any definite sonic difference in my system, but do have a vague sense that it is probably better than just a surge protector if there's a storm, etc. Hum is inaudible at listening distance (and my hearing has been relatively recently tested and is still quite good).
A neutral power conditioner shouldn't impart any sonic characteristic other than perhaps making the music seem a little "louder" due to a lowered noise floor. Other conditioners may soften the highs somewhat, or impart other sonic characteristics, but these cannot be considered neutral, and are chosen for the flavors they add to the sound.

I've read that a PS Audio Humbuster may eliminate the transformer hum from the Powervar if the hum is an issue.
PS Audio P-300, nuff said. For source componants only. Use a PS Audio High Current Ultimate Outlet for power amps.