As far as specific options go, I'm thinking 50mm. I'm stuck between rim brake or disc brake.
My "daily driver" road bike keeps popping spoke nipples pretty reliably about once a month or so and is getting REALLY annoying. One way I could go would be to throw some carbon wheels on my current aluminum framed rim-brake road bike and just be happy with that for the time being. (this is likely the path I will take)
Another way I could go would be to finally get off my butt and build a second road bike like I've been wanting to do for a while now. I have a set of aluminum disc wheels already and if I pair it with a carbon frame this would likely be light enough for my liking. However, I can't find a good deal on either a new or used disc carbon frameset. The tsunami/seaboard cr05 is pretty close to appealing at $470ish, but still a bit expensive. If I pair it with some carbon wheels then it won't be that horrible, weight-wise. If I can catch a good enough deal on that frame and some carbon wheels, it would be a LOT more appealing. I've been riding an old steel vintage bike that I recently rebuilt, so I do appreciate the qualities of a good steel frame. This path towards a disc build is a little less likely for me, since it will end up costing the most no matter which way I slice it. Ultimately I'd like a more modern disc carbon roadbike, but it might just have to wait a while and I can be happy with my current bike if I just replace the current wheelset.