Getting a new dash, what else should I replace?

[Mutt B]

Im going to take my 04 sport into the shop on thursday to get my new dash for free per warranty and I want to take some preemptive measures and replace some of the parts on the a/c. I had some a/c issues last year but it turned out to be just hoses. Im planning on keeping my 4runner for another 6-10 years and don't want to mess with replacing stuff behind the dash later. What should I replace? What should I have them look at? Anybody else do this and if so what did you pay for some of these things since you saved on labor?

 

[Sungod]

I hate to replace good parts and subscribe to leaving well enough alone, but I would be seriously tempted to replace the evaporator and the heater core.