It would be nice to have a quad core but I really don't need it. I am a bit upset about missing the 2gb Corsair xms2 and am2 x2 4200 for $72 that was on newegg a few days ago.
As far as the flashing goes I don't have the link to the good guides but basically you get some files and put them on a floppy then just one a dos command to flash it. Not all cards can flash but most sapphires could. Heres a discussion on flashing the card. Post 45 explains it a bit
Here It Is For All To See, My Unlocked X1800GTO - Page 2 - Overclockers Forums (we can link other forums right?)
If you don't understand what its saying just google it a bit because there is some good guides out there. And if you can't find the files PM me since I probably still have them.
Flashing let me go from a 3dmark05 score of 8000 to 10000 when the card was overclocked.