I'm looking to get a really cool audio rack.
Something that's sturdy enough to hold heavy amps.
Something that can hold or expand to accomadate two big amps and around 8 other components.
Shelves that are deep around 20"......................
Once I finish buying all of my equipment I will buy my audio racks from www.salamanderdesigns.com. You can mix annd match to get exactly what you need, and they have different styles and finishes. Shelves are 19.75" deep, so almost 20". You wouldn't go wrong with those.
Take a look at the Lovan Millennium. It's designed to hold components up to 150 lbs and the glass shelves are quite large. It's modular and you can mix and match the various sizes to fit your needs. I have one and IMO, it is really quite attractive, albeit, a little pricey.
I chose to go to a local unfinished furniture and have a cabinet custom built to my specs. Shelves are 24 inches deep. My amp is 25 inches deep so it sticks out the back a little. The cabinet is made of Birch and was stained to match my speakers. I decided to go this route after inspecting several racks and feeling I was being "ripped off" for the price asked at the level of quality being offered. Many are flimsy, not deep enough, and the boards used for the racks didn't appear to be sturdy enough to hold some of my heavier gear. Expanding would involve me deciding on what additional space I needed and contacting the store which would then custom build the other piece and stain it to match as well.
Never become so involved with something that it blinds you.
Is any of your equipment rack mountable (e.g., has ears)? If so, it's hard to beat Middle Atlantic racks...but I'm not sure that's what you're after (they look best built into a wall/partition). If you want something that looks like furniture, then disregard this suggestion! :)