I would definitely suggest checking out some of the options at the specialist retailers -
FourSevens is good (see the Preon), Battery Junction carries some nice models (see their Every Day Carry recommendations and the NovaTac 120CL), Fenix store is good.
I would recommend getting an AA or AAA single-cell model for EDC, and a double cell for something in a toolkit. If you get serious you could consider a CR123 model (I like NovaTac) but I wouldn't start out with one.
You could also get a photon micro if it is just for occasional use.
Personally I carry an iTP a3 EOS on one keychain, a Chrome Draco (custom) on my other keychain, an NovaTac EDC 120P in my pocket and I carry another custom in a tiny belt pouch - a SPY 005
You carry an umbrella when there's a chance of rain, but there's a 100% chance of darkness every day!
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