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@gbj_tester
Don't even bother with a deep rear wheel for time trials. If it's too windy for a disc, it's too windy for anything with much side area.
The difference between a Hed 3 and a Zipp 808 is only a couple of watts at 50km/h, with the 404 somewhere in between. Or maybe with the Hed in front, depending on who you ask and what assumptions they've made about the yaw distribution.
Also, the order might change depending on which frame and fork you're using.
Different people have different responses to crosswinds on the Hed 3/404/808, some need a shallow wheel as soon as the leaves start rustling and some leave the super deep wheels on in a gale. In general, heavier and/or faster riders are less bothered by crosswind, but again ymmv depending on what the wind does to both the rest of the bike and the big lump sat on top of it.
There's as much difference between Firecrests and older Zipp wheels as there is between 404s and 808s of the same generation.
For Zipp 404/808 above, read Hed Jet/Stinger 6/9 too.
All of which is to say that there is a small group of wheels which belong on the front of a TT bike, but choosing between them a: won't make much difference unless you need just a few seconds to get a bigger prize and b: can't be determined without investing a shedload of time/money testing your individual set up.