I am GASing for two basses up for grabs in the classifieds right now. One is an Ibanez ATK300, and the other is an Ibanez BTB500. I've never played a BTB before, but I have heard them and like their sound and looks. I just sold an ATK100 that I liked a lot and have heard nothing but good things about the 300 model. Which one would you buy and why? They are the same price, and I can only afford one of them right now.