You will not regret your choice, the DB2 is a sexual piece of gear.
I though the same thing about growing into the X1600, but it only took a few months before the effects lost their lustre. I can actually say I don't think I'll ever master everything the DB2 has to offer in the effects department..
Since I'm still waiting (haven't arrived yet) I have a question, the roller / loop function, does it save the loop as a midi sampler would or does it actually just "echo"? Thanks in advance.