Buying from eBay kind of limits your selection. There are lots of cheap ones on there that aren’t good quality. Try Aliexpress or Banggood. For around $15 US, you can get a Convoy S2+ with XML-2 or xp-l. For more power, the Sofirn sp36 is nice too, but on eBay it’s around $50 US. The C9nvoy c8 is a nice light too f0r around $20 US. Comes with all kinds of leds.
Convoy S2+ SST40 with 12 groups.
Choose one of 3 50% mode options and will have good runtime and lumens.
If you are not after throw, More powerful actually no need.
Check Convoy S12 with 3 x SST20 and 21700.
Probably you will need headlamp also.