Adding to LaLe - Monster power conditioners - Namely the 2500's & 3500's aren't for "big pro studios" - Those are entry-level, "bottom of the barrel" for the most part power units.
Not that they're bad - I have a 3500 here and am pretty thrilled with it. I also have dedicated lines for lights, gear, amps, etc. and used to actually run a dedicated step transformer to keep the power at a particular voltage.
Clean power is important in *any* setup. Even a reasonable home stereo (where the 2500 would come in handy).
Personally, I'd suggest the 3500 at a minimum. The 2500 didn't have it under the hood for a recording rig. When you want to compare those to what "expensive" really means, keep in mind that there are power conditioners out there that cost $5,7,10,000 and up. *THOSE* are the ones for the "crazy money" rigs. And that's only after the electrical as a whole is upgraded to a point where it warrants it.
If it means anything, I saw my system-wide self-noise drop by several dB after adding the 3500. I really wasn't expecting that - and I really can't quantify it or justify it with simple physics. But it happened just the same. And the 3500 doesn't complain when you switch on a bunch of class A or AB electronics. It handles huge draws without popping breakers, and it gives you some headroom, electrically speaking. Which is as important as signal headroom when it comes right down to it.
Usually I tend to snub away most things that say "Monster" on them - But those are actually quite decent, and quite cheap for what they offer (don't tell Monster I said that last part).