If you are looking for reasonable operating costs and decent output, I might suggest either the original Huntlight FT-01 at about $30 with a 18650 rechargable battery for 12 bucks. LED. No bulbs. Good output. Nice beam. Bought my last two Huntlights from
www.jsburlys.com.
Alternatively, I bought 3 Fenix L2T AA LED lights for Christmas presents. Not quite as bright as the Huntlight but uses cheap, standard batteries. $40 each from
www.fenix-store.com.
Also just hooked up a group buy for the new Jetbeam CREE 1 AA / LED light for $28 but that appears to be closed.
In my mind, having a number of both types of lights, incandescents are most relevant when people want output beyond what LED lights can provide (i..e, > 120 lumens).