Portable soldering iron

I’m looking for a portable soldering iron to do general work (making circuits, scavenging boards, etc.) and doing on the go repairs out on the field. So far I’m leaning towards butane over batteries. If the soldering iron can do any other jobs, it’s a plus.

my choices so far

http://www.amazon.com/Power-Probe-PPSK-Butane-Soldering/dp/B001DIE9BO/ref=pd_cp_hi_2

http://www.amazon.com/Portasol-011289250-Piezo-75-Watt-Heat/dp/B003HHK7KG/ref=pd_cp_hi_1

butget is about $50 but might do $75 if it’s worth it