disolitude on 10 December 2009
Legend leads in to Underworld story wise, but you wont be lost in either...
Anniversary is remake of part 1.
All 3 are pretty similar in gameplay so you could just do Underworld I guess as its the best one.
Edit - actually do legend and then udnerworld. they are like 6-7 hours long and this way it will feel like one 14 hour game. If you still have the need for more TR, go for anniversary...which actually can be purchased within TR legend game as DLC for pretty cheap.
