kingsam said:
...,i need a 120/160g drive,usb2 or firewire or both,any recomendations...
you make no mention of budget? If you want a ready to go solution then be like me (

) and get a Maxtor onetouch 300 GB external.
It has both firewire and USB2 and I would hugely recommend getting the largest you can afford for future expansion and/or the ability to hold more than one backup image. IMHO Firewire is the technically superior WTG and it also leaves your USB bandwidth free for other purposes at all times.
If you seriously want to save money - then go for the enclosure and 5400 solution - this has the advantage that if your backup drive dies you can swap in another one, unlike the one touch....
One other thing - you can rack up multiple one touches daisy chaining them
