You absolutely want to test the bikes because the geometry and measurements online may not be 100% accurate. I had my heart set on a bike because I believed the geometry was accurate but when I went to the store, it clearly was a bit too large for me - curious, because another bike in the same brand had almost identical measurements online but fit like a glove in store.
I did not demo the Nova Pro, but my husband did and he said the ride was very good. Redline's smallest size is available only on their lowest model, which stores around me did not carry.
I am currently riding the Specialized Crux, also in the 46cm, and the standover/stretch is comfortable, but I have longer legs than torso despite being 5'2" so I am not sure how others would fit. Do note that Specialized makes the 46cm only in the aluminum Crux, not the carbon ones.
2011 Specialized Crux, aka (Toxic Honey)
I'm faster in kilometers!