shape
carat
color
clarity

5k budget for e-ring (princess solitaire)

This 1.06ct one gives you great cut and white F color, however it is SI2 so I'd call and ask if it's eye-clean. It might be given that Princesses are very busy diamonds and these inclusions don't look huge or black.

http://goodoldgold.com/diamond/8925/
 
The WF and GOG stones look great. I'd pick the WF one over the GOG one because the GOG one looks like it has a bit more leakage around the corners of the table. As for the JA ones, I'd rule out the 0.91 because of leakage (fuzzy appearance in the center). The 1.03 looks great in terms of light performance but is significantly off-squre.

So if I were you, I'd stick with the H/VS2 from WF.
 
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