Something not yet mentioned is how you're planning on securing your gear inside of a rack. Does the amp you're looking at racking need front AND rear mounting or is it light enough that only mounting it to the front rails will be sufficient? If the amp is at all heavy its own weight will eventually warp the front faceplate and rack ears/rails after many miles and shows of rough load-ins/outs, so it may be worth considering a rack than lets the amp site flush on the bottom of the rack enclosure itself and takes te pressure off of the rail mounting points of contact. However, then you open up the can of worms regarding regular vs shockmount racks and if the extra bulk and weight is worth the protection from drops or trauma.
I'm using an SKB Roto Shockmount 6U rack for my Furman Power Conditioner, Aguilar DB659 and Aguilar DB728. It's super heavy all loaded up (around 110 lbs) and has me actually looking into buying an Ampeg SVT or VR because its LIGHTER by comparison (sad, huh?

), but the SKB functions perfectly and is about the best "buy it now" option out there IMO without getting into custom-made ATA cases which I'm looking into.
If you happen to be around Austin then shoot me a pm and we can meet up over a beer and you can check out my shockmount rack!