Have you considered other brands?

I test rode an '09 Ruby and certainly didn't feel I could fault it in the quickness and responsiveness categories (and I wanted to hate it). I'd say it took a, very respectable, 3rd out of my 6-8 test-ridden bikes. I liked the Scott brand I rode only slightly better, and my Wilier....well, my Wilier blew them all out of the water, but that's beside the point.

I'd take the Ruby I test rode on our fast group rides no problem, so if you don't like the aggressiveness of the Amira I don't think you are going wrong to look to the Ruby, it's not all that "relaxed" in the grand scheme of things and seems to have plenty of get-up-and-go.

Caveat: I have no idea if they changed the Geo for the Rubies from 09 to 10 when they introduced the Amira, so take my test ride experience with a grain of salt.

My take as far as "changing" either bike is this. You can certainly set yourself up more relaxed on most any aggressive race bike using spacers and an angled stem (while still getting the right saddle to bar distance, but basically changing the amount of drop). There's a limit to this (how much steerer tube is available). Slightly more confined trying to get an aggressive position on a relaxed bike (run the stem with no spacers, maybe a negative angle), but the Ruby isn't all that relaxed, so yea I'd agree with them. But, that's changing how aggressive your position is, not the ride characteristic of the bike. Wheels, if anything, would be the best bet for tweaking that (wider tires or rims known to ride "smoother" may smooth out the Amira, and stiff climbing wheels may make the Ruby feel racier)