Man...
I think I'd pull the trigger on 2 for Fultz/Saric/#10. I have a ton of faith in Saric, think he's one those guys who's just waiting to explode with a bigger role. He's an absolute monster fit at the 4 with our core and he'd probably be our best player right off the bat. At #10, we're guaranteed one of the Bridges/Carter, all of whom I think are quality starters, Carter and Mikal especially.
You have to believe in Fultz isn't broken, but he's seriously the ultimate "buy-low" candidate in the NBA right now. The college version of Fultz has multi-positional eligibility at PG/SG (so not a lost cause with Fox at all) and in theory should be able to space the floor once he remembers how to shoot. One of the big calling cards with Fultz is that multi-positional eligibility and having a guy who you could put off ball and still be effective. I'm going to be a believer that one of the best guard prospects we've seen just forgets how to play basketball.