I would only use an AR because I haven't gotten far into the game, and I don't know how plentiful rings turn out to be. But I doubt that the game would only have a limited amount of currency available.
And I just got the game. But I don't have an AR anyway. Have fun though.
If it is short and has a light saber, then you need to get the **** outta there!!! Yoda in Soul Calibur IV; Sonic w/ Beam Sword in Super Smash Bros Brawl.