I'm in the market for a new set of tires for my Cervelo. They came with Vittoria Rubino Pro's, which have been alright. But I'm wondering if anyone has any particularly strong feelings toward a specific tire. I am fairly competitive, and focus on Ironman, with a few half's and olympics thrown in. I use the same wheels/tires for training and racing, so I'd like them to provide a decent mix of speed and durability. Any guidance would be appreciated, thanks.