It's a vital question

[catalyst2]

We debated this for hours at work this afternoon, taxing our little brains whilst consuming vast amounts of time and enormous numbers of e-mails (it was a slooooooooow afternoon) but we came to no agreement. It is so vital that we agreed to differ but I still feel that this important question should get answered.

What is the correct form to write a villain's maniacal laughter?

MWAHA - sounds kind of choked off - like his plan got interrupted part way through his (clearly) premature celebration

MWAHAHA - there's not just enough maniacal glee here, sounds like this is only the warm up

MWAHAHAHA - this gets my vote with just the right balance of menace and celebration

MWAHAHAHAHA - this is almost as good, but it does seem a tad overdone

MWAHAHAHAHAHA - just silly, as if he has got caught on a loop track

So, any suggestions? How should this be written?