Kato,
I checked around, and it seems that the better designed voltage stabilizers all hover around that $2k mark. I had an older Furman unit years ago (AR117) that I paid around $400 for and got pretty good use out of it for a couple of years, but it's no longer working...
I know Equitech makes units also, but their pricing is in the same league as Monster.
The better units are pricy but seem to be worth it. I have not regretted my decision at all, and it was confirmed when I sent out some work to be mastered recently and the mastering engineer commented on the quality of the mix.
Another good example would be the UA 2-610 preamp. Like at lot of other people, I was not as impressed as I thought I would/should be when I bought it; but hooking it up to the Monster seems to have opened up the sound. I was going to trade the UA 2-610 back in to Guitar Center and take a slight loss if I had to, but I have now changed my mind. Tube gear needs stable power, and a lot of us with "project" type studios suffer with frustration with the "DAW" sound (plastic top end, smeared mids). But I tell you with confidence that the combination of good converters, stable clock and stable power will allow you to put focus back on the music.
Hang in there and best wishes,
Jay