I got the 1k with the 128mb upgrade and I have never had problems with it. I love my mp. But I'm pretty sure that if I had the xl,2500, or the 4000 I would love them to. For now I'm to caught up making hot **** to even think of upgrading or selling it. So I think no matter which one you'll get you'll be sucked into it. Try going to like guitar center, or sam ash and get a feel for them. The 1k is very easy to move around because of its size. At the time I got that one because thats all I could afford. But I have no regrets. Plus I like the color. But I'm really digging the color of the 2500 to though. Take time to make youre decision. Check what features does one have that the other doesn't.