ask the guy what the lifetime warranty includes... i stand behind my work for a reasonable amount of time... usually about 2 years... figure if its have any "issues" show up from the paint job... it will most likley be in that amount of time..... be leary of a place that will offer too much just to get the job in the door.
and with your time frame.... i would really suggest keeping the job as simple as possible. hmmmm i think i allready said this before