Leadtek
I have the same card as you(Leadtek gf2 ultra)
I agree that the ramsinks are pretty much pathetic, I did two mods on this card, the first was add a 40mill x 40 mill x20 mill Sunon fan and used 4 rubber grommets and just superglued the grommets to the top of the existing fan and stacked the more powerful fan on top of the other one. (I'll post a pic later)
The second thing I did was remove all the heatsinks as they are all held in by pins and not glued in with thermal adhesive.
After determining that the ramsinks are pathetic, I wiped all the white thermal grease off of everything and used arctic silver on the gpu and reinstalled the main heatsink. Next I replaced the ramsinks with Radio shack heatsinks that fit nicely but due to the overlap of the gpu heatsink I had to affix them sideways covering 65% of the ramchip surface, but according to my testing this achieved better cooling than the stock flat heatsink. I didnt permently affix the Radio Shack ransinks with Arctic Silver adhesive because I may replace the main GPU heatsink after I am done testing. I may try to affix a small peltier (52watts) with a silver coldplate and a alpha low profile heatsink at a later time. (that mod achieved me a 10% speed increase in my retired Leadtek GF2 Pro)