I'd say probably 5 string just because I really like having the options it gives you. As for bass there are a lot of awesome choices and I don't really think there's a totally wrong answer. My favorites would be Warwick, Ibanez, Yamaha, LTD, Schecter. For models I'd look at any Warwick. Thumb, Corvette, Streamer. For Ibanez I really like the Soundgear line and almost anything in there is going to be great. Yamaha is almost anything as well. The attitude, bb, bbn lines are all awesome too. LTD look at the b5 or d5. For Schecter I like the stiletto and studio lines. Look up any of these if you haven't seen them and hopefully one of these inspire you.