If you have a two inch sleeve, it would be easy enough to get PEX in, say 1 3/4" diameter and run it through the sleeve. That way if you get deposits or sediment build up over the years you still have plenty of open area. You can drop it to a more normal 1" once you get inside the house. It would be nice to see if you can buy a roll that is long enough that you don't have any joints inside the sleeve. Joints are always where pipes fail first.
I was a little suspicious of plastic water pipe when I first met it, but it is code compliant, has been around a while, and if there was anything bad about it I figure we would know by now.