been riding the I9s for years now. My first set is bomb proof and those were, at that time, the ultralight wheel set. only issue I had was after doing a crappy weather ididaride where folks where replacing hubs and bottom brackets due to the rain and wet and crap. I had to replace the bearings, not a big deal.
For the record the ultra set I still have and it has been through a trip ashvillie and two trips to blueridge, and all the trails the swamp club trips hit. I am not by anymeans a gentle rider and I've never had any issues with the wheels.
Got a set for my 29er SS - no issues at all, got a set for my wife....no issues at all. use a set now on the Giant anthem for racing and crashing...no issues.
I will say one thing, you do need to have the hubs looked at every so often like any piece of "high performance" gear just like changing the oil on a car. I9 also makes a standard hub for J bend spokes with the same engagement as their straight pull hubs.
At the end of the day any of the choices you have listed should be fine.