SOG PowerLock for me. It is the best of the bunch, and mine has held up great in the 18 months I've had it, and it gets used hard.
I carried a Gerber original MultiPlier for about 10 years, and it was a great tool. I originally replaced it with a Leatherman Wave, but it wasn't as heavy duty as I needed, and I ended up bending it using the pliers. Once I got it warranteed, it was traded off.
I would recommend the SOG as my first choice, and the Gerber 800 as my second, due to the indexable carbide wirecutters.
My third, and last choice would be the Leatherman Supertool 200, or even the original if you can find it. These tools are heavy duty, and will stand up to whatever you may dish out. The SOG has the edge in the pliers department, due to the compound leverage gearing.
Now, the ultimate would be a SOG PowerLock, with the indexable inserts!
