Pathfinder, being the Paizo-operation extension of the 3.5 rules after WotC continued to D&D 4th edition, seems like it should fit, but I wanted to verify before I went around posting anything.
My friends as I don't always play dungeon fantasy, but when we do, we prefer Pathfinder.
Stay murder-hobos, my friends.
Oh, that's a decent way of doing it. D&D's various incarnations are plenty, and you can still find some people who'll enjoy the older editions and the like as well (my friends and I were considering running some AD&D, but that was around the time my schedule became untenable for gaming).
Well, GURPS isn't particularly popular, when compared to some other big names like Shadowrun or maybe Vampire: The Masquerade, but I quite enjoy the system, and the wide variety of things you can do with it. It works for almost anything; the only thing that gets wonky for me is when you have very high point-buy characters (1000+). But none of my friends are interested in any kind of "supers" game, so I've never even tried it except building characters for fun.
We had 3 completely different games all running in the same world one of my friends created (Seophan, I believe it is) at one point, all of which were great fun: The dungeon fantasy game, which was the first one that started with the large group; we ran a short military campaign where we led armies in a war that was going on elsewhere in the world; and we also had a "merchant adventure" campaign which promised virtually no combat and the point was to explore, trade, and get rich. In all three games I played completely different characters with different skills, personalities, etc. DF is obviously D&D's forte, and you could swing some kind of military campaign, but good luck doing a merchant game without some heavy changes to the rules.
Other games included a Star Trek campaign and a game that had a distinct feel to the anime Trigun (wild west with lots of "lost" ultra-tech lying around). Only having to learn the one system for playing such massively varying games is a huge plus.
I plan to also open a general RPG sub, but I wanted to space its foundation out as to not flood s/newsubs.
Separating D&D from the rest of the RPGs was something I planned from the start, as D&D and its many variants tend to dwarf the volume of discussion of all other RPGs combined.
I won't be good conversation for GURPS. They made great sourcebooks in the 3e era, but I never got fond of the underlying system.