Ok, good info. I see you mentioned the T90 above. You can get it for just under $70. To me, that is a very good deal because already has all the important ingredients (Great driver (very few capable high current drivers out there), reflector, heat sinking, cell capacity, and switch). You can go dedomed XM-L2 for super thrower like Relic built, MT-G2 for more light, but less throw, or dedome the SST-90 and put it on a Noctigon and resister mod the current up to 15 amps.
Check you my recent T90 build. You can replicate it for lot less effort by just using a Noctigon and smushing done the emitter wires to a thin and you can get them. Will probably need a copper disk or two to get it closer to the bottom of the reflector.
EDIT: Edited to list SST-90 option.