I've been thinking about getting a second bike and was considering the Cannondale fifty-fifty which is equipped with an 8 speed internal hub. But after doing a little bit of research I haved cooled to the idea.

Here is why:
(disclaimer - these are second-hand impressions all formed from reading postings here and elsehwere)
1) Some people report very noisy hubs especialy while in low gears riding up hills. Sometimes described as a coffee can rattling sound.
2) Check Sheldon Browns site. He may be favorably impressed but many worry about durabiilty.
3) Overhauling - many bike shops are lucky if they have one true mechanic. If it needs attention will your mechanic be up to speed?