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
Consider the Powervar ABC 1200-11 toroidal balanced power conditioner. For $229, it's a no-brainer, and it'll do what the uber-expensive balanced power units do...but for considerably less. Heck, if you don't like what it does in your system, you can re-sell it for nearly what you paid. What could be less risk than that?
I will also suggest looking at some of the BPT options that may be a stretch on the old budget.

And for what it is worth, I agree that dealers or even members that may be listing something should disclose that fact and only be responding if they can be adding something useful other then an advertisement to the discourse.
dealers or even members that may be listing something should disclose that fact and only be responding if they can be adding something useful other then an advertisement to the discourse.

Hey Maineiac, if that comment is a dig at me it's unfounded. My recommendation of the Powervar is a real world, low cost, common sense approach to a widely used conditioner, and the link I provided is not an item I am selling, nor do I know the seller.

I suspect your objection is to the link to the Audiogon classified ad and not to the recommendation, so let me try this another way.

Powervar power conditioners are used by hospitals and industry. They provide power conditioning comparable to esoteric audiophile power conditioners for considerably less dough...an ABC1200-11 retails for $1200 but can be found on E-Bay or in the Audiogon classifieds for 81% less.
I'll second those Powervar and Oneac units. They do what they're supposed to, are well engineered with quality components. I'd put them up against the audiophile grade conditioners at a multiple of their cost here and on Ebay.
Keep in mind that you could encounter a buzzing or humming transformer those PowerVar or Oneac units depending on their condition and also if there's any DC present in your power delivery.
Here a link to an excellent paper explaining the conditions that cause transformers to become noisy:

http://www.plitron.com/PDF/AES.PDF