Ive got an EFII Ghia, and very happy with it.
Some other stuff to watch out for include,
Shocks tend to go very very quickly.... I bought new shocks last year, and they are already starting to go on me again.
Check for smooth operation of electric windows. (Especially front ones). If they dont wind smooth, it could mean that the plastic bits on the winder may give from the stress.
Also, the EF's got a Coil pack (similar to the AU models), but was removed for the EL models (Reverted back to TFI Dizzy)....
1 of the reasons for this is that the coil packs were not too good in the heat, and would die ?????? (Though Ive had no probs with mine).
As for head gaskets, also check the coolant condition, and Radiator overflow bottle, as this can give you a good indication of potential problems with regards to Head Gasket condition, and Head Bolts.... (Its very important to flush the radiator on these cars, often !)
Apart from that, you may wanna check out
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There is info on the Premium sound system fitted to the EF/EL Ghia's, as well as wiring diagrams, EF/EL Model Specifications, Common problems, and info on some mods you can carry out.