"built half 105/ half dura-ace and with ultegra."
How can you have half 105 and half dura ace then some ultegra?
Yes $5k is a lot to spend on wheels and like others mentioned if you are new to racing why drop all that right of the bat. Buy a nice set of wheels you can use in all races and maybe a rear disc for tri's. I just started racing this year and use bontrager race x lites, they are decent for the racing I do, mostly road with some crits and few TT's. As I get better I will probably upgrade.
I just get something decent like either the race x lights or some mavic ssl's until you are sure racing is for you.