Keep your present bike. Wait for some NOS 571mm GP4000's to pop up on ebay and slam them on the Zipp's, then save them for race day; you might also consider a disc cover (EZ Gains is quite good) on the rear. Pick a used 650c wheelset (they also pop up on ebay from time to time) and fit it with cheap tires for training rides. If you are training often on a direct drive trainer, tires will last for years. Good luck