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As @Pifko said, even if it's not mine, I would go for a second hand frame and spend on wheels, skin suit and helmet.
Although there are aero gains to be made on the frame, the main thing you are getting is a bike with geometry suited to a good position, that's where you gain the most.
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What size road bike do you ride? Do you have a fairly aggressive/aero position? What's your budget?
I am 5´11 and I ride 54cm tt and fairly agressive Position. I am looking to spend around 500 Euro for the frame. But I would like to spend less ;)
I can borrow a Trispoke and i have velotec skinsuit. Some Mates can also lend me an Giro Aerohead for the races.
I would suggest a 2nd hand frame and save up for the front wheel, skinsuit and helmet.
Something like a Cervelo P2C, P3C or the newer P2 (if budget allows). I got lucky with my P3C and found it for ~£400.
What size road bike do you ride? Do you have a fairly aggressive/aero position? What's your budget?