Doctor. wrote:What's the strongest team U7 could possibly make with the characters that they have available?
Goku, Vegeta, Future Trunks, Freeza, #17, Gohan, Majin Boo, Oob, Cell, Piccolo?
Goku, Vegeta, Golden Freeza and Future Trunks are a given.
17 and Ultimate Gohan should be next.
Majin Buu at quite the distance between them.
Piccolo is shown to be at least on par, if not stronger than SSJ2 Gohan, so he's next.
Then, I would take Goten and Trunks. They're weaker than Perfect Cell (and maybe Dabura), but since the tournament is only 48 minutes, Gotenks could make up for both of them in just their regular Super Saiyan form. They should be able to keep up for 18 minutes, after which they could fuse and when cornered still have SSJ3 as an ace up their sleave. That's not mentioning SSJ2, which shouldn't be as straining as 3, but since we don't know how a fusion works with I'm not taking it into account.
It depends if you want to take the risk of having one less fighter for half the battle, at the cost of strength or just taking the safe route with two weaker guys, in which case Cell and Dabura are the next choices.
Uub I feel shouldn't be as strong as Kid Buu of the bat. He's above a regular human and, when angry, strong enough to give base Goku some trouble, but I don't think he's stronger than a Super Saiyan.
If he is that strong, yeah, your choices are pretty much correct.