i am a good fan of the Gsxr thye have yet to let me down a very well built bikr IMO.. the Kawi is getting better reviews in the past few years, but of course the die hards are gonna say they are the Best :P, but i do have to admit they do have the look as well. cya around
i have only ridden a gsxr1000 and that has been awhile ago. I have ridden a honda rc51 and it was pretty bad, then i had a zx6 636 and a yamaha r6, but this bike pulls alot more than anything i have rode.
i really dont know if they actually make an extention for 500 ninja year of 92, if they did i would only recomend a 6 " extension and a 280 would look nice with a nice set of chrome rims or polished ither or. as who to recomend i dont have anyone in particular. I just put a 6 " extension on my Brothers Busa w/280 tire Looks awesome! of course we had to move the Plate to the swing arm due to the wheel eating it up :P any other questions send em my way I try to help ya out.
If you are looking for a person that can manufacture one from scratch i know nobody that is capable to do so sorry.