You haven't really defined what it is that you want from these wheels, or what you are riding at the moment.
Assuming you are after aerodynamics (a much larger contributor to performance than weight), then the budget beating step would be to buy a deep dish front wheel. It is the front wheel that has the greater effect on aerodynamics and front wheels just happen to be cheaper than rears too. As mentioned above remaining with aluminium brake tracks ensures that you get consistent feel and power front to rear.
In any case I've seen too many carbon brake tracks with molding/joining problems (causing severe shudder) or which just don't stop well enough, to bother with full carbon wheels. Only the most expensive (and i mean EXPENSIVE) jobs have ever been able to provide consistent braking, and they still need specialised brake pads to get anywhere near the power..
I would add FFWD wheels to the above list. I have a set of their F6R-C wheels which have 58mm depth, aluminium clincher rims and spin on the gold standard DT 240 hubs. They are hand build in The Netherlands and use J-bend spokes which are easy to find and replace when repairs are needed. Can be found on-line at very decent prices and the quality is very good. FFWD also do various other rim depths as well as discs and track wheels. full carbon tubular only jobs for all forms of road, TT or track racing.
Another worth considering is Citec from Germany. They do clincher and tubular versions, but interestingly their tubulars, despite having a full carbon rim structure, feature bonded and machined aluminium brake tracks so you don't have to change pads. Nifty.
