Mats - ask HiFi Dave how much he'll sell you a NAS Space-Mat for - I haven't compared it with the custom Herbies/Sound HiFi mat Dave Cawley sells, but I think they may be similar - a loaded foam of some sort that stays squigded for a while when compressed and not very expensive at all. The Space-Mat won't be quite small enough diameter to clear the lip on the Techie platter, but depending on the severity of the lip on current production (my SL150 lip is very slight) it may not be the issue as it can with rubber type ones...

Re-wiring is always a good idea and possibly getting the later arm (two or three months to save at £25pm) which I believe is titanium... Otherwise, Johnnie at Audio Origami has had good results with damping inside the arm pipe. You could try some spira-tube on the outside of the pipe and I think there may be some custom counterweights available for "mass-loaded" Techie arms.

Sorbothane boots are a great idea too and I'd ask Dave Cawley about the regulator mod, which may possibly work with the otherwise standard power supply.