Just ran the Rustler at 25/87 (about a 9.5:1 FDR in a heavy ass Rustler!) for about 10 or so minutes of continuous running (WOT passes, tons of wheelies, etc.) and got the following temperatures:
Motor- 130F
ESC- 115F
Lipo- 110F
It's about 80F out right now with a strong breeze (so I'm sure that helped). The cool part was that it had enough grunt to still wheelie at half throttle!
All of this while staying relatively cool. WOO!
As for where to buy them...I found a few places that carry the medusa V2 line, but none have the 60mm 2000kv version you are looking for sadly...:(
I'll see if I can find this one site that I'm PRETTY sure they had all of the motors in stock (at least a few weeks ago they did).
Found a site with the 36x60mm 2000kv motor! It's the 5mm shaft version though if that matters.
http://www.rchover.com/inc/sdetail/132324