If you like the icey white stones, I think your best bet would be to get a G/SI if you want to go larger. I personally am not that color sensitive and like J colored stones if they are well cut, but everyone has their preferences.
I think you can save quite a bit of money if you drop down in clarity at least to a VS2. You shouldn''t be able to see anything with the naked eye in a VS2 and many SI''s are even eye-clean. Why pay for what you can''t see? Who cares if they are visible in a microscope?
I like the G/VS2 posted above. Although, if you really want the higher clarity, the stone you posted has beautiful proportions.