best fireplace insert for a flip

[Ric Weidner]

howdy BP'ers

we have a house we are rehabbing (flipping) in Denver that has two fireplaces, the upstairs has a working gas log set up from the 50's, cute but probably not terribly efficient. the basement has a fireplace with a gas pipe stubbed to the fireplace that is currently a wood fireplace. we are thinking of keeping the downstairs FP as wood burning. the question is what to put in the upstairs fireplace. tell us your thoughts:

gas insert ?

electric insert ?

other thoughts ??

thanks