....and while Tarmacs are fine bikes, and I'm positive that the 'Mac could easily be made to fit you perfectly.....it's still not going to feel like the Cervelo; and you will ALWAYS be aware of that fact for as long as you'd own the Tarmac, if you were to buy it. Get the Cervelo! The cost difference will seem insignificant a year from now...but you'll be glad that you got the bike that "speaks to you" for many years to come.
I've never ridden a Cervelo....but you've got me wanting to try one!