Power Conditioner Help

I have read several of the Threads regarding power conditioners and there are a few things I have observed.
1. Like most things in this pursuit - there are proponents and naysayers
2. There are alot of different types and products out there
3. There is of course no best solution

With that in mind - I request recommendations for a power conditioner for $700 or less - new or used -

Here are the facts
1. I live in a MAJOR urban environment - high rise apartment building, etc
2. I have alot of other "equipment" on the circuit with the stereo/video equipment and only two outlet close to all equipment - running another line from breaker is at this point not feasible
3. I need something that can accommodate, tube pre-amp, dac, large TUBE TV, digital front end, cable box, dvd player, and a few misc devices - I need isolation from one another! as well as from other equipment that shares circuit
4. I plan to plug the amp directly into the wall on one of the outlets
5. I did some voltage testing and it appears I have a pretty steady 124V
6. I love the music - I want it to sound as it "should" - I don't want something that is going to leave a signature - I want the black background without limiting dynamics.

Please feel free to recommend more than one as a list ( I like lists as you can see)