Thanks for your help guys. All this information was very useful.
After reading this I took the risk and flashed my phone. I installed the Android Revolution with Sense 3.0 a few minutes ago. I did made the backup of my contactos, but I think I skipped the backup of my stock ROM. I'm downloading apps again from market and I had most of the third party apps' apks so I'm installing. At the beggining ROM was sort of laggy, but now it's working great. Sense looks pretty nice. I'll test a few days with the stock radio to see if I should change it.