I would highly recommend Zipp 808's (front & back). I've found that combination more flexable than an 808 on the front and a rear disk wheel. My second choice and even better for training would be Zipp 404's. Both are $$$ but I've been riding 404's for years, purchased my 808's last year for my TT bike and like them all!!
I too would highly recommend the Zipps. I race on the 404's. Not tris, but crits and road races.
HOWEVER, they are pricey with a capital P. "Buying speed" with such wheels only works if you can put out 300 watts continuous and can ride over 23 MPH continuous on the flat. If you want to save a few bucks and are not up to the Zipps or a rear disc, go check out the Neuvation wheelsets. They are "factory direct" and you buy them online. There is no store to buy them from. I am going to order a set of the full ceramic clinchers myself soon. Many of my team members use them and swear by them saying they are as good as any of the Zipps they have owned. True that they don't have the "sex appeal" that Zipps have, but you can get them for half of what Zipps will cost, even with ceramic bearings. So unless you are pushing 25 MPH+ in a triathalon, you're not going to get big time differences between a 808 with rear disk, 404's or Neuvations. But if you want every precious second and can swallow the cost, then by all means, ge the Zipps! They are sweet!
One last caveat, if you go with any high profile carbon rims. These carbon low spoke count rims are really not intended for 200+ lb riders. I have no idea how big of a rider you are. Zipp does make a cyldesdale version for the larger rider. If you ride the standard carbon rimmed wheel and weigh over 200+ lb, eventually you will shatter one on a pothole. That's the way it is with this type of whelset.
)
)
