Thank you ALL for your suggestions! It's very clear to me to go for the studs! Since I don't yet have a pair of diamond studs, I think this is the time to make the investment. Thank you for your input. 



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Definitely studs. And if the budget is up to $2600, I'd go for the .66 ctw pair.
http://www.kwiat.com/round-diamond-studs/1572/18154
I have the exact same solitares as you are considering, and I'm so happy with them. The three prong platinum martini setting is so lovely and really lets the diamonds sparkle like crazy.
As Ame said, ask for platinum backs if you have an allergy problem, otherwise the white gold ones are fine.