If the Ducks plan on keeping Hiller after his contract is up next season, then the money still owed to Bryz and the money that will be owed Hiller will be in the same ballpark. You'd have to think Hiller will be looking for a 4-5 year contract around 6M per. So you're talking about a 5-6 year committment (next year at 4.5 and then an extension) at around 29-35M total compensation. Compared to Bryz's 7 years, 34.5M remaining after this year.
I fully understand the argument that you have Gibson in the wings, but the counter is, if you want to keep Hiller, you have to make a committment to him. He's not gonna sign a 2 year deal to be a placeholder for Gibson.
Hiller could have those demands, I don't think he'd be likely to get them though. Giguere only got 4 years @ 24m total, at age 30, off the back of winning a Cup. Hiller would have to put up some really stellar numbers to justify a bigger contract then that, specially at age 32.
I like Bryz, I don't think he's been as bad as some say in Philly, but I just don't think it's a wise decision (for Anaheim) to commit that much money to a goalie, without even seeing what their current #1's potential contract demands would be. I'd think Anaheim would rather try and get Hiller on around a 3 year deal, instead of acquiring Bryz currently, specially with Gibson in the wings, who hopefully would be ready by 2015/2016-ish.