Depends on if you do it yourself or take it to the pros. Pros will be a bit more, because they get paid for their time and of course you get their tail light guarantee. Best way to know is to make some phone calls, quotes are cheap. They will try to convince you other stuff needs to get done though...of course, they are as bad as lawyers and doctors with wanting money...unless you use someone reputable. I'm not going to drop any names like KOR or anything, so don't even ask.
Like the other guys are saying though, don't mess with it until your compression drops off. If it is running good now, once you start cracking it open, you never know what problems could come up from there. Save your nickels for when you really need them. I:I