powder coating is a much more durable finish than what you can do with a spraycan plus you do the whole wheel. i never heard of a DIY powder coating kit.
i have been looking into it myself. i actually have some sample colors right now. the cost is shaping up like:
$25 per wheel to powder coat
$25 for 3lbs of powder (if he has it in stock it's free)
$10-20 per wheel for sandblasting (depending how intricate they are) 94-95 EX wheels should be $10-12.
i have also been quoted from another place $250 for blasting and coating. prices do vary and quality can differ. the shop i'm going to is small the guys doing the work are also the owners so i'm sure they'll do a good job.
also, some places may not even want to deal with you cause usually you pust buy powder in 55lbs boxes. luckily this guy said he can get me the minimum which is 3lbs. so i'll have enough leftover to do another set of rims atleart if someone wants to buy it.