[G4] AGP hard drive question

[JayB]

I've upgraded my g4/500 to 1ghtz via Sonnet.

One of the factory 18gb Ultra II SCSI drives has cacked.

Questions:

What are my drive options?  Can I replace it with a regular ATA drive 
(plug & play)?  Or is there going to be a problem with this ultra SCSI 
cable inside?

How do I shop for best price on said drive (besides Froogle)?

What brand (Hitachi,Maxtor, etc)?

I don't need tons of space, but I'm sure I can't get any drives under 
80gb.

Thanks!!

~Jay