Two more I forgot about. I haven’t personally ran these but this is what I've heard about them.
For an all around very low downforce body look at the PSE Rx792 GTP at:
http://www.parmapse.com/rcitem.asp?n=99001
This PSE Mazda GTP body is supposed to be good for carpet but I've only ran carpet once in the last 10 years and that was a few weeks ago on a small 60x40 track in San Diego so I wouldn’t call myself a carpet expert. Anyway, here's the pic:
http://www.parmapse.com/rcitem.asp?n=99036 .