I'm a medival based RPG fiend... Does anyone out there have any suggestions about a new one to try?

Ever since Baldur's Gate/Baldur's Gate II, I've been hooked. I tried WoW and got hooked. After a year, I quit it. I bought Dragon Age II. I liked it. Then backtracked and bought Dragon Age Origins (and its expansion. LOVED Origins! Reminded me most of the BG series). I'm looking at Dungeon Siege III. Should I start with 1 and 2? Is this series on PS3? Thanks in advance for the suggestions.