If you go the rebuild route, make sure you get new head bolts, do not re-use the old ones.

I rebuilt the top end on my '89 V6 3.0 back in the spring. It had dropped a valve seat on the #6 intake. I had the head shop put in all new exhaust valves, new guides, cut the 11 good seats, and install an oversized seat to replace the one that dropped.

It was $950 with a complete Felpro gasket set for the entire motor, new head bolts included from the head shop, and they tanked/blasted my intake and air plenum. I pulled the motor to replace all the seals while I was in there.

If you do the job, and you are going to keep the rig, you would want to do the following:

timing belt
tensioner
tensioner spring
water pump
thermostat
knock sensor jumper wire
hoses/belts

Possible things to replace:

Knock sensor (under the intake, expensive to replace, but hard to get to later).
idler pulley, if worn and notchy

You could quickly get up to $1200 or so for parts and labor on the simple head rebuild.

Mike