Hi, When getting a new road bike the best thing is to get fitted to the frame and then try different bikes out as different frame and components will feel different between brands/models and then the 2nd most important thing find a saddle that suit your ass,
If your in a social bike group try other peoples bikes and get they opinions on there toys,
And if you haven't already got a set of clipless pedals and shoes look into them as there a great investment
http://bikeshopgirl.com/2010/05/clipless-pedal-advantages-and-disadvantages/But I like the masi bike better because there made in Italy and has heritage in the name, the components are entry level but we all have to start some where and you can all ways up grade in the future when/ if you need a new child..
Lots of people ride giant and the rest of the big brands for there name sake, but the smaller companies local and overseas are just as good if not better and you will get more looks on it cause its different..
I have my second Olmo that was custom built to my likings with campy stiff and what I wanted specificed on it cause I wanted something that was different and comes from the best bike making area in the world, then my other child is a steel giant that I only got because (a) it's yellow (b) steel (c) I crack the previous steel bike frame and did want the repair bill fixing it 2 time round (that was the best fame I ever owned only cause the geometry)
As for what Jenny said , the down side to used bike is you don't get warranty on it, you don't know how had its been treated and the ware on components may cost you more than the $700 -$900 you looking to spend on the Masi which has a warranty.
Carbon frames have a weight limit if you read the fine print of max 100kg from memory and speaking to sales reps years ago when I worked for a bike shop, the other downside is you cant repair cabon frame, unlike steel or alu frame that can be repaired,
Yeah Dura Ace is good that's because it the top of the line from Shimano but you can't totally rebuild it like you can with Campagnolo which is better and slightly more expensive in every group set over Shimano ..
Cheers Tracy