I like the design of the Buells but don’t know a lot about them. I like the older Ducati monsters. I might get a naked bike for my next ride. depends on how much money I have.
Try stay clear of the tl1000s and tl1000r.i have riden both and neither handle very well.You will spend all your coins trying to go arround corners rather than on making it look good.vtr1000 would be better and they have heaps of bottom end.SP1 or rc51 i think you call them would look good naked,maybe an crash victim bike.These have pull all through the rev range and top end not unlike a inline four.I used to own one and loved it but not a passanger friendly ride so i changed bike when i got married.
OR BUILD A TRIUMPH>>>>LOL
I think that the Aprilia SL1000 Falco is a cheep and punchy big twin. Good suspension too,better then the VTR1000 they say...
It would make a good starting point for a naked. But it will take some work to get it to look good.