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
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I must have gotten my Powervar from the same guy as you Tvad. These things are the real deal and at 229 so much cheaper than other iso-transformers out there. I have no hum issues at all.
Mike
Tvad - Yes, I was referring to the transformer hum. The Powervar I used (ABC1200) had varying levels of hum by day, sometimes quiet in the morning and then noisy as heck at night. I tried some additional damping of the toroid, helped a little bit but not enough.