Q 46

If I have the Vilhon Wilds background ("You can reroll any Dungeoneering check, but you must keep the second result, even if it is worse.") and I'm a 5th level Ooze Master ("When you make a Dungeoneering check, you can roll twice and use either result.") ...

Can I roll Dungeoneering twice, decide that I don't like the result, and roll one more time? Or, heck, roll two more times and take the better of those two?

I still haven't bought myself the Rules Compendium, so I don't know what the latest wording is for powers that involve multiple rolls for one result.