6 Components + A Big Amp: Which rack?

Given your desire for a double-wide rack approach, though not inexpensive (for two racks), I'd suggest looking into the Sistrum racks and stands. You can find them in the manufacturers listing under Star Sound. They are fully adjustable and will definitely improve the sound of your system and not just the looks. I think you'd get the best performance with the amp on its own stand, but if you want double-wide (or two racks) the Sistrum racks will easily accomodate your amp dimensions. Good luck.

I'm using a Lovan Sovereign AVR rack. It's double wide (43") and sturdy. I have my 95 pound amp and 60 pound turntable on the top shelf. It's also segmented, so you can buy additional racks if desired.

John

Check out the Billy Bags 4600 series. Not cheap but build
quality like you wouldn't believe. And you can specify the
spacings between shelves when you order. And you can even
get it with a 4th shelf. That's what I did. I keep my 36"
TV on top with my 8 components below. You could easily use
the 3-shelf version and keep your TT/phono-stage on top.
The spacings I used from bottom-up: 12" (for amps), 10" (for
CDP and preamp), 8" (VCR and DAT deck), 6" (DVD and tuner).
That's 500lbs of equipment and the rack is rock steady!! No
vibrations going up that bad boy!!

Here's the link to the Audio Advisor ad for this particular
rack (I ordered directly from Billy Bags):

http://www.audioadvisor.com/store/productdetail.asp?sku=BB4600&product_name=Model%204600%20Rack

A separate rack for a TT? How much vibration is really given off by other components if they are isolated/coupled?

No turntable should be on the same rack with the equipment. The turntable should have a dedicated stand with nothing else on it. Suspension TTs use lightweight rigid stands. Mass-coupled suspensionless use heavy rigid stands.

Check out Lovans products..
They have a great line of quality racks that are
Stackable... you can have a double wide rack that will
accomodate all of your gear...plus they can be filled with materials to deaden the sound and have all isolation points at the legs.
Check out my Home Theater Virtual System
http://forum.audiogon.com/cgi-bin/fr.pl?vopin&1022936456&view
Pics of My gear in one are there...
Try Audioadvisor as well..
Good luck,
Joe
Custom Audio LLC

Try two smaller racks placed side by side. You really don't want two many other components on the same rack as your turntable.