Thanks for the pointer to the comparison drives in the review Brian.
Not really, though 2TB WDs specifically have positive reviews on both this site and elsewhere, and I'd like to source locally so I can re-assemble and put back into use quickly.
The Samsung F3EG looks like a possible contender (I've seen the 500GB F2 recommended as very quiet, so I could maybe take a chance on a 2TB F3 being cool & quiet too).
Here's my criteria thinking...
Cool running, silent, with low vibration, and draw as little power as possible: The Time Capsule is used in a quiet working environment. It already runs very hot, has minimum cooling capability, and the 1st gen is reportedly susceptable to blowing power capacitors, thought to be heat related. So a green/eco drive sounds an ideal companion for it.
Primary use is backups and data transfers over Wireless 'n', so sequential read/write performance is unimportant.
Time Capsule auto-spins down the drive after 5 mins at idle. Fast spin up would be a bonus to avoid access delays, but not if it causes heavy power draw.