What brands and type can I use for my iMac 20" internal Hard Drive?

what brands and type can I use for my iMac 20" aluminium internal Hard Drive?
can I use WD caviar black?
is it too hot?

If you are replacing the drive because the existing one is faulty, that's one thing. If you just want more space, you should take advantage of having a decently fast and relatively small capacity drive in there now (instead of a huge drive). Get an external FireWire drive and off-load most of your user data there. Make your internal drive dedicated to mostly your OS and app files, with plenty of free space. That setup will make your iMac run more efficiently. I won't go into more detail, because I'm not answered your specific question... You can post back with any questions, if interested...
To answer your questions...
You should be able to use any SATA 3.5-inch drive internally, but you should probably keep it at or under 1TB. The main concerns are power usage and heat dissipation. A drive like the WD Caviar Green would be ideal in terms of power and heat, but they do have slower (or variable) spin rate. I have one as an external drive (750GB) and it is amazingly quiet and cool. If I had to replace the internal drive because the current drive failed, I'd put it inside. I'll trade a bit of pure performance for the efficiency (including low noise), and these drives are more advanced with higher data density and larger cache, so the trade-off from slower spin rate may not be so bad.
You can check your current drive's model number (which is shown in System Profiler) to get the specs online. The stock drive in my old +Late 2006+ iMac is a 7200 RPM drive. The Caviar Black is a 7200 RPM drive, with a newer design. So if you want to use a Caviar Black in there, I think it would be OK.

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What brands and type can I use for my iMac 20" internal Hard Drive?

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