Advice Needed for Engine Performance!!!

Ok I have a K2 600 I have a Micron slip on and thats pretty much it as far as peformance goes. I want to gain a lil top end speed but also maintain my acceleration. I am interested in buying a PCIII, i need more info on how it will affect my bike and also I am looking into changing my sprockets but im not sure what type of setup I want. Also I am aware that a full exhaust will help out alot but I cant really afford that at this time. So if someone could possibly just leave me like a messenger id and a time when they could discuss a few things with me that would be great. I have aim and msn. I need advice asap.