I play Upright bass, and have a Warwick Thumb neckthru fretless4 string, and i'm thinking to get a fretted bass. I play alot of rock, funk, jazz, metal, anything. I'm looking to get a g&L L2000 bass but i just saw their 2500 model. Should i go 5 string? Even though i have a fretless 4 would it be hard switching between the two of them?