I am a beginner/intermediate guitar player. I started late at age 37 and have about 2 years in the instrument. I currently own a Line 6 Spider Valve 2x12 combo amp and a Ibanez RG 2570 Prestige guitar. I've taken a few lessons from private teachers and also have been working with the Metal Method guitar course by Doug Marks. I've been thinking about trying to learn how to play bass. I have no idea where to start. I guess the first thing I need to do is buy a bass and amp. Which bass should I start with? Should I get a 4, 5 or 6 string bass? I don't want a cheap bass. I'd like to get something that I can grow into. That said, I don't want to spend a mint. Maybe 500 to 800 bucks??? I was thinking about getting a Line 6 Lowdown amp. I figured that would be a great place to start since I already use their guitar amps and like them. I was also thinking about ordering some lessons on DVD from musiciansfriend. My favorite music is Dream Theater and progressive rock/metal/fusion/alternative. Really love John Myung!!!! ....and Geddy Lee. Please advise! Thanks in advance!!