i agree with the above. the wheels you listed are what most people upgrade from. just dont want you to be disapointed.

check these out. they are not to much more than you said you could spend but should be a lot better wheels.
http://www.bicyclewheelwarehouse.com...d&productId=34

still for Tri or TTs i would want something more aero. say william system 30s etc. i paid under 500 shipped for mine and they are great wheels.

another cheap set thats more aero (just a tad heavy but still lighter than the 2 you posted above)
http://www.bicyclewheelwarehouse.com.../prod_184.html

there are also some easton crits on bonktown right now for $199!! better hurry!!