I see your point about all the air above the COMP but all the sectors look pretty damn overbought right now. I have RSI readings in just about every sector including the indices at points where they normally top out. In fact in most cases I am seeing bearish divergences in the daily MACD as well.
I would look for some down to work off some froth in the next few days. Even if it were to take the shape of some choppy down. That would allow the indicators to work off their O/B levels and set up the final move.
The other possibility is sharp down tomorrow with a GDP rally on Friday lasting thru EOM.
Would post some charts but my Hypersnap keeps crashing<ng>