One's personal budget and photo-shooting interests would be a big factor. Investing in good glass to build up your arsenal of lenses seems never-ending. This is an expensive hobby, but one that I enjoy very much. Let's see, "Best complete lens collection?"
1. Macro Lens: Canon 100mm f/2.8
2. Ultra Wide Lens: Tokina 11-16mm f/2.8
3. Standard Zoom Lens: Canon EF-S 17-55mm f/2.8 IS
4. Telephoto Zoom Lens: Canon 70-200mm f/2.8 L IS
5. Super Telephoto Lens: Canon 300mm or 400mm f/2.8 L IS