I love the color on the Vita Elite myself. You obviously love the color too. Is saving $200 over the course of one year worth not getting the bike that you are drooling over? Yeah, I'm also an enabler.
Try riding the Small. But also know that the bike shop can raise up the handlebars of the XS bike with risers. Also, they can provide different stem lengths to make the handlebars closer or farther away from your body.
The more you ride, the more comfortable you will be in a plank position (I kept lowering my handlebars and then had to flip the stem as I progressed in my biking speed). My triceps get a good workout from biking!

