Hi Clintd,

Well, you can probably find a IDE hard drive that is faster than a Jaz. I don't know if the sampler can fully take advantage of the extra speed or not. Where the Jaz drive can be convenient if for storage. When it fills up, you can put in another cartridge and away you go. This is not as big a deal if you have a CDRW drive that you can make backups of your samples though.

In terms of sample CD ROM libraries, I highly recommend them. However, they can get quite expensive, especially the orchestral ones. I'll give you my recommendations:

Piano - I haven't found one set yet that I like. I haven't tried most of them though. I tried the Ultimate Piano from EastWest. Not that great. It is usable and the sound quality is good. I found it not to be dynamic enough for my taste. Play ff didn't give me the same attack as when playing a real piano.
Bass - Bass Legends by Spectrasonics. Excellent.
Drums - Loops or Hits? NYC Drumworks is pretty good. There are many good ones out there though. One CD Set will probably not cover all of your bases. I like Burning Grooves also. Not a lot of selection but has some good loops too. These are acoustic drums though and I don't know if you're looking for electronic style drums ala 808/909/Linn. For 808/909 type sounds there's a gazillion on the net that you'll be able to find without having to spend a dime. I would spend my money on good acoustic sets and search for others on the net. You won't find good acoustic sets with variations on the drums hits as you will on a CD Rom
Strings - This is where it can get expensive. Prosonus has an orchestral set that isn't too bad and the price is okay. After that you pay quite a bit of money for the Peter Siedlaczek, Miroslav Vitous and Kirk Hunter string libraries. While these are great, they are expensive.

HTH and sorry about the length of this post.
Fernando