Pls help me choose diamond for men's band

[philw007]

I'm looking at .3-.5 carat to go in a ring similar to:
http://www.metamorphosisdesign.com/meteor/13huckdiarda.html
D-G
IF-VS2
cut prefer ags0/hearts image because I am not able to interpret the ratios to choose a good stone without this...
ideal polish/symmetry/cut rank

One E/IF/hearts option intrigues me:

http://www.jamesallen.com/diamonds/E-IF-Ideal-Cut-Round-Diamond-1275723.asp?b=16&a=12&c=77&cid=131


Some others hearts options that catch my eye:

http://www.jamesallen.com/diamonds/E-VS2-Ideal-Cut-Round-Diamond-1527140.asp?b=16&a=12&c=77&cid=131

http://www.jamesallen.com/diamonds/D-VS2-Ideal-Cut-Round-Diamond-1241731.asp?b=16&a=12&c=77&cid=131

http://www.jamesallen.com/diamonds/F-VS2-Ideal-Cut-Round-Diamond-1527088.asp?b=16&a=12&c=77&cid=131

http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-2290953.htm


Others that are interesting, but not sure how to compare these to the hearts imaged diamonds listed above. I like the fact that they are D-IF's, but unable to judge/compare them cause I can't interpret the ratios. Are these worth considering or pass on them cause they don't have any hearts images?:

http://www.b2cjewels.com/dd-3313681-0.41-carat-Round-diamond-D-color-IF-Clarity.aspx?sku=3313681&utm_source=pricescope.com&utm_medium=referral&utm_campaign=pricescope.com
interesting medium fluoro

http://www.b2cjewels.com/dd-3337679-0.38-carat-Round-diamond-D-color-IF-Clarity.aspx?sku=3337679&utm_source=pricescope.com&utm_medium=referral&utm_campaign=pricescope.com

http://www.b2cjewels.com/dd-3290416-0.40-carat-Round-diamond-D-color-IF-Clarity.aspx?sku=3290416&utm_source=pricescope.com&utm_medium=referral&utm_campaign=pricescope.com

All of the above are in budget...just looking to get the most brilliant/firey/impressive stone. The idea of IF and/or D would just be for personal satisfaction...and is less important for the "best looking' diamond.

Open to any and all thoughts and opinions! Thanks in advance!

I apologize in advance for those who already read a similar post...ps won't let me edit the title and the post to better reflect what I want to ask.