Personally, I don't worry too much about warranty on drivers! I've only ever broken one, it was about 20 years old and I over torqued it anyway! The only time these things really get worn is when you use them on crappy screws, which isn't covered by anyone's warranty anyway!
So.. Just buy some decent ones and don't worry about the warranty!
My favourites - Snap On are always good. I have some old square handled drivers from the 80's that have lasted really well and are lovely to use. Perfect for automotive work, but I don't use 'em on crappy screws!
My other current favourites are PB Swiss (with the hard handles) and Nepros. I think the PB are probably the best drivers out there, but I keep mine for cleanish tasks! The Nepros (with the wooden handles) are so good they are almost too good to use, but I have no doubt they are durable!
Some of the aerospace boys I work with use a lot of Phillips, and I see some Zephyr drivers around which some reckon have the best tips, but I havn't tried them myself!
I've got odd drivers I've acquired over the years by makers such as Mac (hard handle) Proto (same shank, different handle), Wiha, CK and even British made Stanley!
Most have been, at worst, O.K. So my advice would be to try a few, see what fits your hand, and what suits your usage! I'd avoid soft handles for garage use as they pick up too much grease and grit, and for Phillips and Pozidriv I tend to keep some decent drivers, and a couple of cheaper ones for when I have to tackle cheap screws with poor heads!