Gosh - interesting stuff! I think they're making a mistake getting rid of the 105 (but that's just my humble opinion).
I'm intrigued that you say the 4 door 78 is going to be called the 76. There has, for some time, been an HZJ76 made for the Japanese (and other Eastern) market(s). This is a 4 door station wagon with a 78 front end, but it's quite a bit shorter than the Troopie (78) and the body doesn't 'flare out' behind the driver doors like the 78 does. I wonder if this is the 76 you mean, or where there is a new one - Landcruiser model numbers are always baffling?
If it is the 76 I'm thinking of, it should be a pretty decent car. I used to have the predecessor of the 76, called the HZJ77 - it was quite a nice car - 1HZ engine, 24 volt electrics and fairly well trimmed - including an engine driven winch as standard. Only real problems with it were a) the body was a bit too small (for carrying stuff) and b) it had leaf springs all round, so drove like a boat. I think the 76 has springs at the front, so the latter wouldn't be an issue.
Anyway, good luck with whatever you get - you couldn't really go far wrong with either huh?!
(04 KTM 640 Adv 'Naartjie'/11 KTM 990 Adv 'Tsumeb')