G'day listers

Am I still in the dark ages backing  up to CD?

I have just found SuperDuper and it seems to me that using it with a firewire drive would be a lot easier (read I would backup more often) + I like the idea of bootable backups.

SuperDuper recommend firewire drives from Other World Computing, WiebeTech, LaCie or Maxtor OneTouch

I have about 40GB to back up from a 160GB internal drive.

I thought of 2 automated rotating backups - weekly and monthly - so I would need 80GB minimum.

Do I go for Firewire 800 (my present Mac says it only does 400) and do I go for 7200 drive speed and any recommendations as to brand.

Thanks in advance for advice.

Dudley Gager