Advice on X-Prong Setting

I've ordered a 1.51 carat Radiant from Whiteflash and I now need a ring.  I'm looking at a simple Platinum X-Prong type setting from Vatche, which is similar to the one offered by Tiffany & Co. with their Lucida diamond.  I'd like a simple setting because I will be buying my soon to be fiancé a 4.5 TCW Radiant Eternity Band (I'm not sure if it will be channel-set or prong-set) and I don't want the setting to take away from the center stone.  In any case, my questions are this:

1) Does anyone have experience with the Vatche X-Prong ring (likes/dislikes)?

2) WF quoted me $1,320 for the setting and to set my diamond.  Good price?

3) Any recommendations for designers of X-Prong rings other that Vatche?

4) Will this setting work with either of the eternity bands like I'm looking at?

A picture of the Prong-Set Eternity Band I'm looking at (mine will be around 4.5 TCW):

http://www.thefacetscollection.com/item.cfm?item_id=1064

A picture of the Channel-Set Eternity Band I'm looking at (mine will have Radiants in it):

http://www.thefacetscollection.com/item.cfm?item_id=858

A picture of the Vatche X-Prong setting:

http://www.whiteflash.com/Engagement-Rings/Styles/Solitaire/Platinum-X-Prong-by-Vatche_650.htm

A picture of the Lucida setting:

http://www.tiffany.com/expertise/diamond/rings/engagement_lucida_ring.asp?ring=lucida&

I tired to attach pictures, but I keep getting error messages?