Have you guys heard any good or bad things about the Pentax istDL 6.1MP? I'm looking to upgrade to a more substantial camera for college. I've been into photography for a couple months and I've been using my family's pointandshoot Kodak EasyShare. It took alright photos, but the batteries drained so fast. The only thing that worries me about this Pentax is the 4 AA Batteries? It says you can use lithium-ion ones? Or d'you think I'm looking into the wrong brand. Any help would be great!