For me, 20-135 f4 L IS. Just a might wider, and a mudge longer than my 24-105... f2.8 would be nice, though not throughly necessary. I wouldnay mind the weight or size (I'm big...). Though I would be satisfied with f4...
Also, Canon 100-300 f4. Sigma once made one, and it was wonderful! Maybe make that 70-300 f4... make it EF-S and we'll call it a day!
And, I'll second that 11 f2 ,,, (maybe I just shutmeself up and go pony up for the tokina 11-16 2.8...)
And, a 50-150 f2 IS...