TallAdam,
The best bet is to get a trainer and work with it daily. Sandy @karambit.com should be able to help you there.
The aluminum versions are great, the plastic versions are a bit lighter but still work well. Some folks I train with use both versions. The best method is to find a good instructor who will train you safely and correctly in either the Fillipino or Indonesian methodologies.
Steve Tarani's books, videos, dvds, are a good way to learn or pick up some additional techniques.
Ray Dionoldo also offers trainers, tapes, & live blades and is a supporter of Martial Talk website.
Have you checked out this yet?
http://www.martialtalk.com/magazine/subs/feb2004.pdf
it may give you some insite as well.
As far as Live blade versions there are LOTS coming to market, some like the Tarani's, Emersons, Cutter Knife & Tool, and Szabo brands are very good.
STAY AWAY from the cheap *** imports like "Mtech" , They will just screw your technique up due to improper design.