I like heat, but flavour too.
I think ghost peppers would so much of an overkill for me.
If you're in Cape Town and like your tequila hot - head on down to Bob's on Long Street, across the road from Stones for their Chilli Tequila.
My first time in, they had the standard green chilli.
Then they pour your shot, fish out the chilli, break 'em in half and place them in the shot glass.
HINT: Swallow the damn chilli in one go.
They've upped the heat with what looks to be Habeneros floating in the bottom of the bottle these days, seeds and all!
I love the stuff - but always have a Hunter's Dry at the ready if the burn gets nasty
Be warned though - a friend and I both "lost" our cellphones there a few months ago after a raucous night :twisted:
Another friend's eyes and nose started getting watery just when smelling it!

Had to have whipped cream from a can to cool him down
At R10 a shot - its a good way to get your burn on.
They've got bucket loads of more variations on their tequila if you don't find it to your liking.