We just installed a gas powered fireplace without the blower. My DH talked with alot of people in the business about them and we decided on one that had alot of BTU's enough to throw some heat without having to use a blower.
The blower was extra $$ and we were told they can be noisy/rattly too, that's something to think about too.
We got it with a damper I think it's called so if the room gets too warm, we can dump the heat to another room it's vented in to too and still keep the flames going as opposed to having to turn it off if it gets too stuffy. We liked this mainly because of get togethers when the room gets crowded and hot, this a great option to have in the unit.