Not really-
Some of the rust converters may be worth the extra penny but you probably won't even own the bars long enough to actually see any performance difference in the Paint
The other thing to consider is that bars get beat up daily and there ain't no paint out there that will stand up to the harsh conditions.
Powder coating is pretty durable but even that coating can chip.
The Key to a good rattle can paint job is following the Re Coat time instructions- I know I say it a lot in these posts- but the paint needs the time to cure before the next coat is applied.
If done too soon then the next coast will react with the First coast- breaking it down and then you'll need even more tie for the paint to Dry/Cure.
Sometimes you'll end up with an Orange Peel effect and that sucks- if the entire piece looked like an orange peel it wouldn't be too bad but it is usually just in a couple spots, which looks like Crap.