Quiet external hard drive for use with Time Machine?

Few questions related to Time Machine:
1- what external hard drive that would be good to use with Time Machine, that also runs relatively quietly? Since TM runs 24/7, am looking for one that is quieter than my current G-tech.
2- Please confirm what size is optimal relative to the size of the internal hard drive.
3- I currently use a separate external hard drive as my bootable disc.  Is it possible/preferable to have these be on one and the same drive?
Thank you.

1. I like these (have three of them) - literally whisper quiet:
http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/eSATA_FW800_FW400_USB
2. You should allow 2 - 3 times your internal drive's size for TM.
3. No, it'd be best to be on another drive - you can create separate partitions, but if/when the drive fails, both of your backups would be gone. So, keep your clone on a separate disk. In fact, it's good to have two different backups.

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