I like smaller logs a lot, but if you want heavyish hits and an 18 mm format with really clean and almost endless power, I can vouch for the the DBV with the baller upgrade.
I was able to get a factory second dbv from elev8 for $150US and the baller upgrade was something like $70 I think. Maybe just slightly over your budget but the power is easily ball vape level in a log format.
Check out OG SSV43 vs Baller Upgraded SSV Heater Chamber Difference...? - #6 by TigoleBitties