Update:
I went to a Giant/Specialized Shop today and tested 5 bikes... all over the place from Roubaix Pro, Roubaix Basic, TCR Pro, Defy Pro... Tigara, 105, Ultrega, Dura Ace Di2. Basicly all they had at my size.
It was awesome to feel the differences between all those bikes. The Roubaix Pro was soooooooo nice to ride. The TCR was the fastest one...but only a bit faster than the Roubaix Pro.
2 big cons on the Roubaix Pro...a.) way over my budget; b.) the shock was tooooo much for me. it catapulted me out of the bike when i drove on bumpy roads (but the rep said, I can adjust the "shock"/"spring").
They had no basic defy in store. So I still cant testdrive that one.
No rebates on bikes they order. On the Roubaix Baisc it was 10%.
So my list so far with prices incl tax (and shipping):
Spec. Roubaix (Base) - 56 - Tiagra - about $2200
Trek Domane SL4 - 56 - Tiagra - about $2300
Giant Defy Adv 2 - M/L - 105 - about $2600 (no rebate)
Giant Defy Adv 3 - M/L - 105 - about $2200 (no rebate)
Giant TCR Adv 2 Pro Compact - M/L - 105 - about $2140 (no rebate)
Canyon CF SL 7.0 - S - 105 - $2290 (no rebate) - no CF 7.0 with rebate in my size
...