personally, play 1-10 in order, that way u can notice the improvements a lot easier. it was hard for me to go from ix, to x, to vi.

theres no game to finish in xi, its all about getting ur kicks with your friends.

and i don't think mystic quest is worth time. the others you can go about at your own leisure(?)

some may tell u to play vii first. but i played vii for like 10 hours before i got hooked on ix, and well, i personally fell in love with both ix and x. you could play which ever 1 interests you the most, and then go in order, lol.