For my current XSI (crop camera), if I had the money it would be:
10-22mm (EF-S)
70-200mm IS f2.8
24-70 f2.8
If I had a full frame:
70-200mm IS f/2.8
24-70mm f/2.8
16-35 f/2.8 or 17-55 IS f/2.8
I'm a fan of covering the widest range with less lenses.
Other lenses are the primes, 50mm or 85mm or 100mm macro.