May as well replace the o rings on the cam plugs in the back of the heads. Much, much easier with the intake plenum out the way. New plug wires? Get the good ones (Mitsu or check my thread). I hope they've putting good plugs in too. Don't want to change those in a hurry either.

Are they replacing the water pump with the TB job? Definitely should. TB idlers too. What about accessory belts and idlers? How many miles on the hydraulic TB tensioner? Probably should replace that too. I know it's another $100, but if the old one fails after you've invested in a TB change... Mine did was still working at 145K miles when I changed it. Your call.

Can't think of anything else right now, but again, look over the thread I posted above. I replaced pretty much every seal/gasket there was in there <img src="/forums/images/graemlins/cheers.gif" alt="" />