I have Scorpion2 trail on my RR wheel set, and Road 5 on the cast wheels for purely road use.
To clarify - the road 5 is not available in 19 front sizes, so that is currently out from the picture.
The Scorpion 2 trail is a brilliant tire, I have not yet found anything to fault it. You won't find 160/60r17 for the oem rear size - so you have to use the 150 wide rear tire.
Edit: forgot you've asked about the 19 bike, the following is for L2 owners only, but once I've typed it on my mobile I rather jeep it here, hope it will be useful for someone.
Having said that, for only road use I'd use the stock 17/17 cast wheel set and would use Road 5 on it. The R5s are great in fair weather and excellent in the wet - they just don't let go. I find the 17 front wheel better on road, so I change the wheels for on road (17) and mixed terrain (19) adventures. Btw, I've converted my spoked wheel set to tubeless, but even then, the spoked wheel set (mainly because of the heavy hub at the rear and the very heavy brake disc spider at the front) is heavier than the oem cast wheel set.
Hope this helps.