Replying to Which bindings should I get?

Hi NS. I'm getting new skis and bindings for this season. I've decided on skis already (Line SFB) but still quite unsure about bindings.

I have two choices: Look Pivot 14 and 18 (or the Rossi equivalents). I run DIN 9 so that's in range for both bindings. I might run DIN 10 this season though, because I'm a bit heavier than last year. The 18s are a bit more expensive (290 € vs. 320 €) but the toe pieces seem a bit different on them. Are they better? What's the main difference?

I'm willing to pay the extra for the 18s if there's a real improvement over the 14s. If not, I'll just get the cheaper 14s. Help me out!