I'm a huge fan of fireplace inserts.
Our current house's fireplace needed $10,000 worth of work to be usable, so we opted to get a wood burning insert instead.
3 years on, it's still fantastic (this
http://www.hearthstonestoves.com/sto...le-wood-insert )
Granted, it's not gas, and I'm not sure if you're placing it in an existing fireplace (you mentioned ventless...), so your mileage varies...
Hope nobody minds the additional data point.