SainSmart ToolPAC PRO32

Hear very good things about this. TS-100. Extremely portable and battery powered.

Hakko 888

Highly praised. Professional grade digital soldering station.

FEITA Mini Portable Soldering Iron Kit

Heard good things about this.

KSGER/QUICKO TS-12

Orderred one of these but waiting for it to arrive.

Weller

I have an analogue soldering station from Weller. Performs admirably. Is analogue though so you have to manage the temperature often.