Venus Rover proposal;
http://www.agu.org/meetings/fm05/fm0...fm05_P54A.html

Huh, an engine that convert Venus's heat to electricity and simultanously provide cooling system...how clever

http://www.lanl.gov/thermoacoustics/TASHE.html
About temperature
"All rover systems would be housed in a pressure vessel in vacuum with the internal temperature maintained by the TASHE below 50 °C. No externally deployed or articulated components would be used and penetrations through the pressure vessel are minimized. Science data would be returned direct to Earth using S-Band to minimize atmospheric attenuation."

So good news; it will not heat up rapidly (that mission is designed to last 60 days), and I guess if they will use Aerogel than that temperature will be room temperature and that rover will last year.

Don't be so sceptical and pessimistic .

And about spacesuits, yes, there would be a need for a cryogen but spacewalks usually do not last more than a few hours, so it is not problem imo.