Isolation?

I've been reading through a bunch of threads here on isolation material/techniques. Fascinating, some of the tweakers here go to great lengths. Kudos gents. My preamp, CDP, turntable, and tuner are all sitting on a custom made solid oak rack. High WAF. Anyway, put marble under my Oracle turntable, Brightstar boxes under my YBA CDP and Magnum Dynalab tuner. Stock feet under my Martin Logan Quests Z's, placement and kids dictate it's not practical to put spikes under them. I just finished building an amp stand (it sits in my furnace room, below the speakers). I used 4X4 lumber for the frame of the amp stand, the lumber sitting on a cement floor, and for the shelf I made a sandwich. The two outside layers are 3/4" BC Fir Plywood. In the middle is 3/4" rubber. I bought a heavy duty rubber mat normally used to leave yer shoes on, smooth on one side and ribbed on the other; I used contact cement to glue the ribbed side to the plywood attached to the 4X4 lumber, then glued the smooth side to the top piece of plywood. Countersunk 4" long screws to attached the whole thing together. My BAT VK500 sits on top of this sandwich. I was also considering using Tiptoes under the amp, but I'm undecided. First off, Tiptoes are a real pain in the ass to install unless you use two-sided tape and you may end up losing any of the sonic benefits of the points with tape in the way. Secondly, does it make sense to drain energy into my "sandwich" or just allow the current base to do it's thing? Finally, am I getting carried away (again)? Does isolation make a big difference with amps, or more so with source and speakers? Jeff

p.s. amp stand cost me $40 in materials