I usually have 2 sets of wipers (or replace every season, i.e. summer & winter). I find since I do that, I can go with a "relatively" inexpensive pair (but not super cheapo/cheeso). Walmart has pretty good wipers for the price as are Crappytire's mid range. I have found that wipers (high end) still only last about 6 months (b/c of the pits in the windshield) so in my "opinion" go with mid priced/quality and replace after about 6 months...
Just my $0.02.
P