i went through this decision process a few years ago as i was deciding what platform to buy in preparation for my trip. the debate for me was between the 60 and the 80.
one of the factors i have not seen taking into consideration in this thread is what exactly are you considering an 'expedition.' I consider my trip an expedition because hell i'm living out of my car for a year, through 2 continents and 15+ countries. however, as a solo traveler i'm also taking a more conservative course. I have spent plenty of time off the beaten path but it has been in areas that i trusted or knew i could get out of on foot if i had to. i've also come fairly prepared for most situations regarding spare parts, sst etc. if s*** really hits the fan in this day and age fedex can get me a us based part in 2 days to do the work myself. 10 years ago when ideas first formed I would NEVER go in an efi truck. 2f FJ60 was the platform. as the internet shrunk the world (hell i gathered almost all my info for my trip in less than 2hours one night on the internet) and contacts, support etc became readily available, the concerns of ecu's, efi etc sort of went out the window.
why did i choose the 80? comfort, size, ease of driving, durability etc etc. the 60 to me is still the classic cruiser. however coils, efi, lockers, solid axle etc make the 80 very easy to build and drive. i'll be heading out to a little visited stretch (according to my research) of beach in two weeks here in costa rica. 4 river crossings and rugged roads and i have no hesitation to go. this is costa rica. probably wouldn't consider it in nicaragua. i'll have to play it safe in northern SA but in chile, argentina, uruguay i'll be more adventurous. i trust the truck and my ability to fix/band aid it on the trail and get back to society.
now if you're talking 4x4fun race and camel trophy stuff with a team i would say a diesel 60 would be the best route to go. simple, reliable, proven. having driven both i would never change my decision to go with the 80 over the 60. granted i'm not even half way to my goal yet so a lot could happen but i'm sure i'll be able to handle any hurdles.
lastly the 'bling' factor. a scratched up rusted 60 would be a lot less conspicuous. however you start adding roof top tent, jerry cans, spare tires, winch etc you stand out regardless. i get stared at everywhere i go. (perhaps it's because i never capitalize my 'i's) you get used to it. a lot of waves and thumbs up but stares everywhere. the real eye opener came when the hotel clerk and i drove each other's trucks in tegucigalpa (he had a diesel hilux and a bj40 at home.) he mentioned that an 80 series in honduras is a luxury vehicle and people would think i was insane or rich (some of the former, nowhere near the latter) to outfit an 80 like mine and to keep it totally muddy the whole time. after that night i have done my best to be aware of those watching me as i drive by. not that i wasn't before but it really hit home that night. so i keep the truck dirty. i try to drive as conservatively as possible and hope for the best. a true overland rig will always stand out. my goal is to stand out in 'good for that guy' not a 'let's rob that guy' way. whatever the hell that means. so far so good. last two nights camping have been free thanks to the hospitality of costa ricans. sorry for the tangent.
basically unless you are planning for high risk travel most of the concerns with newer trucks can be dispelled through places like ih8mud and expedition portal. fedex, ups, crusierdan, cell phones, sat phones etc. at least in the western hemisphere. if i can somehow manage to extend my trip past ushuaia i'll let you know if i feel the same way.
dmc