Equipment Rack - How important in the grand scheme of things?

My room is well treated with tube traps (in the front corners) and many GIK panels - bass trap/diffusors along the front wall, art panel absorbers with scatter plates at first reflection points, 242 panels on the ceiling. I'm pretty happy with the acoustics at this point. 

I haven't tried the isoacoustic pucks under the amp. I am using the Gaia IIs for my speakers. Why would placing the amp on granite cause issues? Seems like this would be a pretty solid platform, but I'm mostly doing it to provide good ventilation to the amp.

I'm working on building a set of monoblocks (based on the FirstWatt F5 turbo v3 design with a few tweaks) and these will sit directly on the tile floor behind the speakers. I will look at some kind of isolation footers on these when I'm done building them. 

I'm mostly wondering about the value proposition with a more expensive rack for all my front-end equipment versus, say a streamer upgrade (currently using Bryston BDP-2 with audio card upgrade) or power cable upgrades (currently using DIY cables made from DH-Labs Power Plus and Red Wave with Furutech and Wattgate connectors). 

@millercarbon - didn't see your response before posting. I do need a rack since I have limited space for my gear and it has to be organized vertically for the space I have available (other than the power amps). 

Anyone with experience with the Solid Tech racks? These seems like they offer good vibration control as well as being somewhat attractive.

Those Saluda River stands DO look nice. I'll check them out. Thanks.

@kodak805 - Beautiful looking stand (and nice system). Can I ask how much your stand cost you? 

Thanks,
Jay