Chevy S-10 Tonneau covers assistance?

The area I live in has no businesses offering tonneaus, so I'm shopping online which is a huge pain, because there are so many and how do you really know how they look and fit? I had a snap-top which looked really good but once unsnapped it was a battle to re snap, even the guys could not do it..it is trashed now because the tailgate end has flapped in the wind. I like that the snap tonneau covers the whole truck bed (6 foot) and rails, but most tonneaus I see online only cover half the rails and to protect them I'd have to buy rail caps also. Not made of money so the high end tonneaus are out of my reach. Anyone with an S-10 (mine is a 2003...and believe it or not, not even 30K miles on it, I baby it)..or knowledgeable about them or tonneaus with suggestions on what to buy? Thanks so much for serious input!!