io9 has a list with ten of the better weird science fiction novels out there.

Personally I think they give Philip K. Dick’s lesser novels a little too much credit (he wrote some amazing novels, but I don’t count Ubik among them).  Some of the rest are now on my to-read list.

I would like to have seen something a bit more recent, like Glasshouse
by Charles Stross, but to each their own.

Read the list and reasoning here.