The 771BC1-01 isn't a bad choice, given the concerns you indicate.
But for that kind of blade length, I'm much more inclined to the 705 myself. It is overbuilt, unlike the 770, and can stand up to much more in the way of hard use, if called upon. Most will find it superior in terms of opening/closing and grip to the 770, also. In my view, it is the ultimate 'pocket knife', that one.
Arguably, the biggest point in favour of the 770 over the 705 apparent from the standard BM models would be 'elegance' - consistent with the 'gentleman's folder' concept, no doubt. But that goes out the window a bit if you look at special editions. The BM 705 Forum Knife - M2 steel, BC1 coating, polished carbon fibre grip etc - is drop dead gorgeous, for example. You'd be very hard pressed to obtain one of those, BUT there was a 705 special release unveiled at the SHOT show which sounded pretty hot - D2 steel, aluminium with CF inserts grip, as I recall. They don't appear to have been released on the market to this point, but it can't be too long now. Might be worth a thought.