WFRP sounds interesting but I heavily dislike Warhammer (both 40k and fantasy). They are grimdark to the point of feeling juvenile, so I probably wouldn't have fun (I did play some Dark Heresy but the DM was cool and we just fought some greedy mechanicus guys, that were corrupt in the material sense of the word).
Seriously, when I say WFRP 1st edition I really mean anything pre-1989, and a few select things up to 1990. It is an unbelievably good mixture of dark fantasy, humor and horror that probably will never happen again. I'm talking about Shadows Over Boghenhafen, for instance, one of the best adventure modules ever, and it's a pity 99% of PNP enthusiasts will never know about it. 40K or whatever juvenile shit they did with the fantasy setting: agreed, wouldn't touch with a standard 10 foot pole.