New here, trying to decide on an HA Diamond

I've been lurking for a couple of weeks now doing lots of research and trying to make a sound decision on which diamond to purchase.  I've been with my GF for almost 3 years now and I plan on proposing on our anniversary in March.  I'm leaning towards the Legato band in Platinum as she has small fingers.

I'm looking for a round Hearts and Arrows diamond and found these few in my price range.  Unfortuantely I still don't quite understand the best crown and pavillion angles so I was hoping one of you veteran diamond people could help assist :)

Diamond #1 0.901 ct F SI1

http://www.whiteflash.com/hearts_arrows/Whiteflash-ACA-cut-diamond-1843958.htm#

Diamond #2 1.002 ct I VS1

http://www.whiteflash.com/hearts_arrows/Whiteflash-ACA-cut-diamond-1848208.htm

Diamond #3 1.083 ct H SI1

http://www.whiteflash.com/hearts_arrows/Whiteflash-ACA-cut-diamond-1844712.htm#

Diamond #4 1.005 ct H SI1

http://www.whiteflash.com/hearts_arrows/Whiteflash-ACA-cut-diamond-1848275.htm#

I will of course make sure the S1's are eye clean before purchasing.  Thanks for your input!

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John Swinton [1829-1901] Chief Editorial Writer of the New York Times (Considered "the Dean of his Profession" by his peers), when asked to toast an 'Independent Press' in a gathering at the National Press Club, circa 1880

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The business of the New York journalist is to distort the truth, to lie outright, to pervert, to vilify, to fawn at the feet of Mammon, and sell his country and race for his daily bread, or for what is about the same thing, his salary. You know this, and I know it and what foolery to be toasting an 'independent press.' We are tools, and the vassals of rich men behind the scenes. We are jumping-jacks. They pull the strings and we dance. Our time, our talents, our lives, our possibilities, all are the property of other men. We are intellectual prostitutes."