check the artwork forum. This came up several times. The quick summary:
1. Vinyl will wash out colors a little more than paper.
2. Kinkos can print a sample for you to see if you like it.
3. Vinyl at Kinkos with or without an adhesive backing.
4. If you go to kinkos, talk with the guy running the sign, banner printing. S/he will almost always know more than the people behind the desk and will help you out more.
5. Their printers are cmyk (as most places are) and so the colors will not match with a RGB image. The test sample helps here.
I used vinyl for my side art and it's held up for over a year, but people aren't touching it all the time.
I printed my cp art on paper from kinkos because the color matched better and it is covered by plexi for protection anyway.
Hope it helps.
