Here's the giant reference thread on pretty much everything you could ever want to know about flashlights and LEDs. :)
http://flashlightwiki.com/Terminology
Here's a nice source for terminology.
Here's a solid starting point in an SK98. It's great in stock form for $8, and if you wanted to you could upgrade the LED/driver in the future fairly easily. It's around 700-900lm (ignore the chinese lumen claims). http://www.aliexpress.com/item/YUPARD-Mini-12W-1800LM-CREE-XML-XM-L-T6-LED-Adjustable-Zoomable-Flashlight-Lamp-Light-Torch/1389655076.html