Avoid 7200 RPM ones, they're getting too hot for the PS3.
Also, check the height: best ones should be 9.5 mm to fit the HDD tray without modifications.
Otherwise, you can go for larger models (usually 1T+) which are 11.5/12.5mm, but you had to mod your tray.
There's a tut somewhere, just check it out.
PS3 Slim v3.55 + CFW Kmeaw - 250G/USB 1T
XBOX 360 Falconv3/Jtag - Liteon74 1.61 - 500G
Wii 4.2 + Cfg UsbLoader - USB 250G | NDS + M3 Real - SDHC 8G | NDS + R4i - SDHC 4G
PS2 + HDLoader - HDD 200G | PSX + PS Hacker