Granted, the HQ is a valid choice, but even then one can have a wide variety of units (Incubi with or without assault weapons, hardly ever one of each, but two of the same) If you want this to look good, paint 'em up nicely, you have a nice array of incubi that you might not always use if you do the sizing game for eacht fight. Same goes for warriors if you want to have them stand out from the regular grunts (they are the better ones after all), they will not be just warriors but a specially painted unit.
So, even the no brainers can give you some variety (remember, we are talking about looks too, not just performance, so 'just' taking warriors doesn't count, gotta be devoted to what kind and where)
After the no brainers, your list diversifies quite fast. Though I agree 10k points was over the top, I still feel 50% if for flexibility's sake only and not because you truly like it. This only gets worse if you decide the HQ could either be Incubi or warriors. I favour 80 to 90% to be 'steady' and always. Make tactics for that.
I fully agree that you need to decide what it is you like (I for one am not a Talos man, no matter how useful it is) and I have done so. This step is quite normal. My point was that the various formums or solutions do not take this simple thing into account and just collect away.
Remember, Eldar are pirates. I never saw any pirate fighting with one vessel, but having an entire fleet back at anchor just so he can choose another vessel each time. If you have a frigate, good show, but tough against the smaller ones. Have a sloop? Good against the smaller ship (can ovetake 'em) but adjust against the galleons. I feel this elelement is not highlighted enough in DE tactics and culture. The need to adjust simply because....that's all your force is and has to offer. unlike the Tau or IG or SM, DE are a fragmented force that does not stand together....at least a lot less then the others do.
I have appreciation and like a lot the fact that the eternal 'DE are weak' myth is swept away by a good number of articles on the Eldar on line site and formums though. Good show!
Marune