Do you plan on flying electrics eventually? If so you'll most likely end up charging multi cell lipos in which case you'll want a balancing charger. A good fairly priced balancing charger that will charge most other type batteries as well is the Cellpro Multi 4 from FMA direct for $80.
http://www.fmadirect.com/products.htm?cat=45&nid=4 If you do get one don't forget to ask what adapters you'll need, especially to charge your standard NiMH and NiCd batteries.