I've had so many different RPG systems I think I've lost count. Only actually played some of them though (took me years before I found other gamers to play with, before that, I would just make up tons of characters and create cave systems/dungeons to run other characters through, all by my lonesome 12/13 year old self). I've played AD&D 2nd Ed, D&D 3.0 and 3.5, White Wolf's Vampire the Masquerade (and also LARPed Vampire, Vampire Dark Ages, Mage, Werewolf, and Changling, though they were more Vamp games than anything else, just our Storyteller allowed a couple of non Vamp characters other than just ghouls and hunters), Palladium system games (Rifts, Heroes Unlimited, Ninjas and Superspies),TSR's Marvel Superheroes, Star Wars (West End Games version using d6), d20 Star Wars, d20 Wheel of Time (especially with the fan made stuff from the internet, they fixed many issues with WotC's original system), d20 Game of Thrones (from Guardians of Order; this is my favorite version EVER of d20 system, with nicely added mechanics for influences, social ranking and finance; the most politically capable d20 game I've seen yet, you could almost run a vampire game with those rules; so disappointed that GoO went out of business, was looking forward to seeing what they had planned for expanding the system to large scale combat and such). One of the favorite games I've been involved in was one I ran using the d20 GoT book (from GoO) but set in the world of Midkemia (Raymond E Feist's Riftwar Saga's setting), specifically starting in Krondor with a group of low ranked members of the Mockers. Some of the games I've owned the books to were just obtuse and complicated. This definitely includes Mage and Changling (I never really grokked the "magic" system for either) as well as Hero Games (nicknamed "roleplaying for accountants"), and Shadowrun (I would never try running that game, and definitley NOT with a decker in the party!). I actually kinda liked Gygax's Mythic Journey's system, but it took so damned long to make characters it was insane. Of the (A)D&D settings out there, my favorite is by far the Al-Qadim (Zahkara) setting within the Forgotten Realms. After that, the general Forgotten Realms setting (WATERDEEP!!!!), and then Dark Sun. I never cared for Greyhawk, Maztica or Kara Tur (I especially don't like the Oriental Adventures changes they did with 3.0/3.5 mixing in Legend of the Five Rings stuff). Never did much at all with Planescape the settings they developed after that (like Bloodright or whatever its called). Although I love the 3.0 and 3.5 versions of D&D, I still rather liked the 2nd Ed AD&D stuff (kits made the game more interesting IMO). If I was to run a game today, it would be some sort of combination of Pathfinder (the best parts of 3.0/3.5) with elements from the d20 GoT system. I strongly believe that any good tabletop system should have some sort of Merit/Flaw system (like the "Defects" and "Bonus Points" in the d20 GoT system; each defect gave a certain number of Bonus Points, BPs could be spent as follows: 3 BPs can buy one Feat, or 1 BP can buy 3 skill points). I've also noticed that I tend to use RPG systems to help me develope my characters for my writing. I'll create a character sheet for my story's characters (not creating them at level 1 unless the character is supposed to be that inexperienced), adding defects and such, using the character sheet as a guide for the character's background (at least the parts I don't already know) development. For me, it works. Might just come from the fact that I got good at creating a character sheet then writing up a really long background story explaining just about everything on the sheet; did this all the time for my Vampire the Masquerade LARP Storyteller).