I want the power plant that is the most reliable and easiest to get parts for
1HZ. Hands down. They're all reasonably reliable, and the 1HZ certainly is no exception, but easiest to get parts for? 1HZ has been in constant production from 1990-present. There's boatloads of them out there.
I am ok with it being somewhat slow
Good thing! Lol...
You guys tell me where I can find one clean and in good shape
Good luck with that. They're out there, but they're not running thick anywhere. Finding a 25+ year old truck that was intended for work, and usually work in difficult environments, but that's still in good shape, is always a challenge. For reasons mentioned above, I'd recommend looking long and hard at any vehicles from Central or South America prior to purchase. They're often rode hard and put away wet. Caveat Emptor. Cleaner ones can be found in Australia (all RHD, of course), but stay away from any that have been near the ocean. Australians love to drive their cars on the beach (Fraser Island, anyone?) and it wreaks havoc with the bodywork (read: rust). Distances in Australia can be huge, so many vehicles end up with tons of miles after 25 years. Europe can be a good choice (I bought mine there), but try to stay away from northern Europe and Scandinavia, as they salt their roads heavily in winter, which rots old cars terribly. I've found central/southern France, Spain, and Italy to be good hunting grounds for clean(er) Euro Landcruisers. Note that Toyota didn't sell the Troop Carrier in all markets. Civilians in France got them, and I've seen lots that were former government cars in Germany, the Netherlands, and Scandinavia. There's also the Middle East, but people don't tend to hold onto cars for 25 years there, so finding older ones is difficult. Most end up in Africa (same is true for the worst of the Euro ones, BTW).
I am sure there are dedicated importers of the 70 Series Cruisers here in the states
I wouldn't be so sure. Some who can help you have been mentioned earlier in the thread, but I think many have tried importing cars from overseas only to find that after all is said and done, it's just not profitable.
You might try scouring the classifieds and "for sale" listings in all the places I've mentioned above. Cast your net worldwide, as it were. You're far more likely to find something that way. If you do, import it yourself. Not that hard. Hell, if I can do it, anyone can.