You could try:
The Clutch Single 21700
Signature Tips SQ217 (If you want a Squonk)
Boxer BF (Another Squonk)
The Immoral Modz Exile Dual 21700 Parallel
Tons of Tubes by Purge, etc
The Heavy Hitter (More budget friendly, but still hits hard!)
Stuff by Kay Vapers
RCM
Stuff By Snow cap
The list is long. Just depends on how much you are looking to spend, and what exactly you want.
Good luck!