These racks have come along way from the days of the old Target stands. I am using a variety of the fancy stuff about which you express sketpticism- (Grand Prix Monaco with carbon fiber shelves and all the bells and whistles and HRS, as well as a big shelving platform that was custom made by Finite Elemente back in the day for my turntable)- and not so long ago had Adona, mentioned above, build me a small platform for my phono power supply. They use constrained layer damping for the shelving and platform material; it was relatively inexpensive and for decoupling, I use Stillpoints SS. Very effective. (Even Mike Lavigne, who has one of the uber systems here, is using an Adona stand for his turntable and preamp, unless he has recently changed it out). They make all sorts of stands and platforms to order and aren't terribly expensive- a bit more than you indicated you want to spend but not silly money. You may need to consider additional component isolation beyond what the stands themselves provide but I'd second the vote on that company as a possibly- even with a custom job, they were pretty fast and easy to deal with.
