The problem is that I would not go a penny over what he's currently making. It's not like he's earned a big pay day either. Maybe he'd take a similar cap hit to finally stay longer? Sometimes a good fit is a good fit but just like with Luke Schenn, sometimes you get offered a pay day and you take it.
I'd rather extend Bertuzzi over Domi but there's room for both of them around the same number they currently have. But not sure this is the core of players I'd try to bring back if the team continues this pace even if individually they are doing well.
At the moment I think his next contract is going to start with a 3. He strikes me as a guy who would be willing to value stability given he's bounced around a bunch. Go 3-5 years of term and the caphit should be reasonable.
My concern about the free agency route, is that if the team misses any of the prime targets, they're then for ed to trade assets that could be used elsewhere (ie the D) to fill that hole.
I'd also probably prefer Bertuzzi too, BUT problem is his current production is well below what his current caphit is, which then causes a bit of a conundrum for management unless he also really wants to stay a Leaf and is willing to be flexible
Edit: though regarding the future 3C position, I wonder if Tres Monahan connection could be a positive here