I have the korg AX10G, now, maybe the higher models sound better, but I don't think it sounds all that great. however, since you're still using a cheap guitar and amp, I'm guessing sound quality isn't going to be your biggest concern, because it does sound decent, just not extraordinary. so that's why I'm going to tell you to get the AX3000. It'll have lots of things for you play with and have fun with until such a time you can afford better equipment.