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Resulting action was revealing:

Hero calls $4, UTG bets $10 and is all-in, CO calls $6.50, B1 calls $6.50.

What do you put these folks on now?

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Only meant to test my ability to read the situation:

My best guess :

UTG has the nut-straight. Since his raise isn't enough to price out a flush draw he probably has a good flush draw himself (or boat draws). Assuming he's thinking straight anyway.

CO has slowed down, either because he is currently strong but vulnerable to draws or he's extremely strong and is trying to keep you 2 in the pot.

B1 just check and calls. Usually this means a good draw or yet another naked straight.

If you're lucky, you've walked into 3 straights with only UTG having good redraws. More likely, you're facing 2 naked straights at least one of which has a better flush draw while the third player has something equivalent to the nut flush draw.

I suspect the possablities are too open to define a "best" line here. The likely scenarios suggest a split between call and raise (with top set you obviously can't fold here - at least not yet). To make matters worse, raising is likely either very wrong (that worst case scenario I mentioned before is growing more likely - esp with the UTG all-in now) or very right while simply calling means a probable forced fold if a non-pair/non-club comes. Any club leaves you with a very difficult decision indeed.

In the end, OOP suggests either go all-in now, or exercise pot control. I feel, UTG's play has severly weakened your all-in option. So just call and play your boat outs ...

... aw screw it, pot it.

Damn, I'm torn.