You do not have too many choices. You have exactly as many choices as you did in BG. And you have exactly as many choices as in p&p 4E, and noone is being overwhelmed. Well, I guess it's always possible that they are and I just haven't seen it, but I wouldn't count on it.
Nor is game design rendered more difficult by having 4E powers and consumables in the one framework. If they could make it work for 2E, where encounter difficulty scales across a drastically wider range (compare if an 18th level mage is on full, and if they're on empty), then they can most certainly make it work for 4E.
And I thought early on, you were saying to add more things to the game, to attract more than just "hardcore fans". But now you appear to be reversing your position. This is intriguing.
It may not be an easy task for you, but it certainly seems to be easy enough for everyone else. As said, this is all already a part of 4E.
It can be done just by following the standard encounter guidelines. You know, the ones that ppl are using right now to build 4E adventures and modules. That would be doubly true for professional game designers, who are paid to make these things work. Perhaps you should consider whether you are the best benchmark for gauging whether this task is difficult.