Id happily ride the zipp disc, I used to have a Zipp 950 disc before I upgraded to ffwds. But I would say that it seems very overpriced. I sold my zipp 950 For $400aud (same I bought it for) and it was in mint condition.
and don't not get the gear you want because you aren't deemed fast enough. Be aware that there are going to be better and cheaper ways of getting faster, but if you want to have the flash gear then go for it. It's your money. It's your hobby.