That's enough stack height to run a PE..they breathe very well.
If you have a wood lot to work, find some dead <8" trees with the bark falling off; Those may well be dry already.
I'm working on our door weatherstripping now. If your place is older, you may need the screw-down metal flange as in this pic. If you have newer doors, they may have a kerf sawed into the frame for a fin on the other version of this strip. I have that on the next door I'll work on. It presently has a similar V-strip design, but a cheaper version, foam covered with a plastic jacket. I went ahead and got the better rubber stuff..
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Yep, in that case go for the big stove.
Yeah, but that's a complicated cat stove requiring more maintenance and doesn't particularly like a short stack, from some reports. Not to mention that the PEs can be had in gorgeous enamel and/or cast iron jacket, and a cooler over-all look. For less money.