Can someone recommend a make/model of soldering iron for me?

I have a simple 20 watt pencil style iron now that is almost impossible to solder two wires together with. My main use I'm looking for is for making engine/EFI wiring harnesses (soldering wires together) Mostly splices of multiple 10-18 gauge wires, etc. Should I be looking for a high wattage pistol type gun? a workstation model? or?