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Well its kind of hard to answer your question as there are so many turbos to choose from these days. But for a comparison of the output of the van turbo verses a BB turbo I will post the dyno numbers from this past weekend.
Van turbo, stock wheel, ATS housing, 4 inch exhaust, intake and Jody Tipton tuning.
Tony Corn 7.3 PSD 2000 F250 hp-325.8 tq-721.3
BB turbo, big oil, 4 inch exhaust, intake and Jody Tipton tuning.
Don Moody 7.3 PSD 2001 F250 hp-341.7 tq-681.1
Does that help? The "others" are not in the same league with the van and BB turbo. They flow tons more air and require tons more fuel. Not to mention extensive programing. Both of the truck above are running stock AD injectors. Tony's programing would work in almost any 7.3 with stock oil. Don's programming will work in almost any 7.3 with big oil. So thats about as close to an equal comparison as I can give you.
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What FOMOGO doesn't post is Tony's truck is a 6-speed and my truck is an auto. IF we were to dyno the same trucks with the same tranny, I would expect the difference between the two be INCREASED by 15-25hp. There was also another 6 speed truck with similar mods to Tony's truck but with a bone stock turbo...his power was 330/713. The torque is also higher on the six speed trucks because the dyno runs are started lower before the torque peak, unlike the autos which have to be started past the torque peak to prevent down shifting.