Heaters for ice fishing

[Shrimpboy]

I know that this subject has been mentioned before, but I can't find any of the old posts on it. I'm looking at getting some sort of a heater to keep me warm while on the ice. I usually use my ice tent, so is there one out there that is better than others at not suffocating me to death? I might also like to use it outside of the tent when I'm at places like Pineview, so it would have to be something that wouldn't blow out easily. I'll be asking my in-laws to get it for me for Christmas, so I guess I should be looking for something that's not too pricey either. Any suggestions? What do you all use?

-Jack
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