There's an odd dearth of good options in the 6" length. I've had this same question. The Fiddleback Camp Knife looks very intriguing, but it is $350. It is also set up more as a chopper than as a longish companion knife like the GSO 6.
Bark River makes a bunch of knives in the 5.5 to 6" range. Some people have reservations about buying from them, but by and large there are many satisfied BRKT users out there. Look at a Bravo 1.5 to start. Comes in 3V, in two different widths.
Honestly, the ESEE 6 is a great option here. It is a great tool that really handles well, while not being mammoth.
Bark River makes a bunch of knives in the 5.5 to 6" range. Some people have reservations about buying from them, but by and large there are many satisfied BRKT users out there. Look at a Bravo 1.5 to start. Comes in 3V, in two different widths.
Honestly, the ESEE 6 is a great option here. It is a great tool that really handles well, while not being mammoth.