Best HD upgrade for Late 2006 White C2D iMac?

[apearlman]

On my white iMac (Late 2006, 20" C2D 2.16ghz) I've almost filled the puny standard 250MB HD and am planning to have an authorized repair shop replace the drive. (They quoted me $30 plus the cost of the drive -- is that a good price?)

Question: what drive should I put in there? I'm planning to go with a 1TB/7200 RPM drive, but can I or should I go bigger? Faster? Which brands to use, or to avoid? Any suggestions?

 

[Hellhammer]

3TB is the biggest one at the moment. Any 3.5" SATA drive will work. I've always preferred Western Digital but other brands are fine too