Unless you have a very good reason not to do so, I would strongly recommend to start with the OS 8.1 update... (which is free). Even if you don't plan to format any harddisks to HFS+ it still fixes a lot of bugs and is one of the most stable systems I've ever seen myself. From my personal experience, I can also strongly vote for HFS+... I've been very reluctant myself in the beginning, but it works like a charm, and disk related oddities are virtually reduced to zero since I re-formatted. The only thing to keep in mind is that you can't access your hardrive any longer unless you have a 8.1 (or later) boot CD - so if your 8.0.x is your only system, leave all your disks to HFS.