Mmm... SRM crankset. Very nice. There's also the Powertap rear hub setup. Still expensive at ~$1500 new, but available fairly often as used.
Personally, I just skipped all the problems of getting an aero profile and had one built instead. I picked up a
Quest velomobile instead. Granted, doesn't work for triathlons and other competitions, but is great fun for time trials. Also wonderful for staying warm and riding through the winter.