In getting up to speed with all the amp options out there, I'm looking for a recommendation for a head priced new at around $600. I'm a guitarist moving to more bass playing and a first time bass amp buyer. Instead of getting a combo, I decided to purchase a head and borrow a friend's 15" cab (some obscure brand I can't recall - very beat up condition) until I really get a feel for what I need. I figure that getting a head is the most flexible approach and that I will do the research on cab options at a later time. I play a MIM jazz bass with a pick, standard fingerstyle, and muted thumb. I rarely ever slap or pop and don't like my sound to be "hi-fi". I like a warm solid tone with a hint of growl for more rock stuff. I don't need the more extreme sounds found in a lot of metal or contemporary pop. Somewhere between McCartney and Me'shell is where I would like to be. Thanks in advance.