I really want to get a 6 string. I've been wanting one for awhile, and I think I should go for it now. A local music store has an Ibanez BTB 406 that plays pretty well. The last time I went to Guitar Center (which was earlier this month) there was an Ibanez SR706. I also want to find an Ibanez SR506 to try out. These three seem like pretty good basses. What do you guys think? Which one should I go for?