Do I ever hate that 4 letter word: B-E-S-T
It all depends on where your car sits most of the time (indoors or outdoors, shade or direct sun), what the ambient temperatures are, etc.
I think the more expensive blades might work for you if the rubber can survive harsh conditions better than the cheap ones. In my case, I get the cheap blades (Roberk?) from Walmart since my car sits in the garage or in the shade and isn't subjected to extreme heat as much as most others. They're inexpensive ($3-4 range if I recall) and last about 1 year before I have to change them.