Help with choosing the correct diamond

Hi everyone!  This site has been so wonderful in helping me choose a diamond, but I still have trouble bringing it all together (table, crown, pavillion, etc.)  I was wondering if someone can help me out in choosing the engagement ring.  My girlfriend loves Tiffany's, and I want to get her what she loves and from everything I've read on this forum about Tiffany's is that usually you won't get the best diamond you could find but I still want to try.  Here are the stats of some Diamonds I've narrowed down.  Thanks again for all your help!

Choice 1:
1.08 ct, F color, VS2
Cut, symmetry, polish all excellent
Total Depth    62.6%
Table Size       55%
Crown Angle   35.3
Pavillion Depth 42.8%
Flourescence: Faint
Culet: None

Choice 2:
1.09 ct, G color, VS2
Cut - excellent
Symmetry, Polish - Good
Total Depth    60.4%
Table Size       55%
Crown Angle   34
Pavillion Depth 42.7%
Flourescence: Faint
Culet: Very Small

Choice 3:
1.02 ct, F color, VS2
Cut - excellent
Symmetry, polish - very good
Total Depth    61.4%
Table Size       55%
Crown Angle   34.5
Pavillion Depth 43.2%
Flourescence: None
Culet: Very Small

Choice 4:
1.08 ct, G color, VS2
Cut, symmetry, polish all excellent
Total Depth    62.3%
Table Size       56%
Crown Angle   35.3
Pavillion Depth 43%
Flourescence: None
Culet: None

Ira (Ruffles have Ridges) Z.
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