EasyB
(EasyB)
13
If you want a significant throw increase over your C8 (I assume it has XPL HI with 70-100 kcd) I think you want a light with 250+kcd. Because of the way we perceive brightness a 1.5 or even 2x increase in brightness is not very impressive.
Another option is the acebeam T27 with 350kcd from a hard driven XHP35 HI. It is a single cell 21700, so if you use 18650 the capacity might be too small.
Another option in the XHP70.2 in large reflector class is the acebeam K65. It actually comes with the emitter dedomed so it has 250+kcd I think and is a good high output thrower option. It might be expensive though.