I am very confused about the Ibanez BTB series. I played an Ibanez BTB1005 and loved it. There web page also shows a BTB500 (4-string) and BTB505 (5-string). These don't have all the fancy wood that the BTB1005 series has. I'm trying to find a BTB505 that I can play because if it sounds as goods as the 1005 I will buy it. However, I am now seeing on Musiciansfriend.com and other places a BTB400, BTB510, BTB405, and BTB515. Has anyone played any of these basses? What is the difference between the various models? I can't seem to find any in the Dallas area? Are they new? HELP!!!!!!!!