Rebuild or Replace Cylinder Head Options

[6G96GT]

So my head is getting to that point where something is needing to be done. I am thinking about rebuilding it and then porting and polishing the combustion chamber and possibly milling the head for some light compression gains. Here's the question...What's more expensive, having the head rebuilt at a shop or buying a rebuilt head on ebay or somewhere else and then having a shop simply switch the heads? Thanks

[TRD_Ian]

if your doing head work.....rule of thumb...dont re use the head bolts....order new ones as they are designed to stretch and will not tourqe down to the required spec's