If the amount of light the Surefire puts out is sufficient for you, then this would be a good bet (and cheap):
https://www.fenix-store.com/product_...roducts_id=334

if you want more power, this is a big favorite on these boards:
https://www.fenix-store.com/product_...roducts_id=333

grab one of these to mount it
https://www.fenix-store.com/product_...roducts_id=273

and you'll need to get some decent rechargeable aa's to run the light. Various big-box stores sell good deals on batts & lights for a reasonable cost.

Cheers