Whole heartedly agree with the Duracells as the brand to go with. I like them better than Energizer alkalines and Titaniums. I buy them in larger packs of 16/24 and feed them to my GPSr and camera. (Also they make great geocache swag!)

I also use rechargeable NiMH for my equipment but only get about half the life as the Duracells. Lithiums AA are nice in certain types of high current draw equipment. For example, I used a pair in my beard trimmer and they lasted almost a full year compared to Energizer alkalines (1 month). However because of the higher initial voltage and discharge rate of the lithiums, some equipment manufacturers recommend not to use them. Lithiums have exceptional shelf life and work much better in the cold than other batteries but cost considerably more.