Oh, that's great to hear that you are hiking the PCT!
I honestly have very little to add in the discussion of particiular shoes, only because it is a very personal decision.I haven't tried Inov-8 shoes But there are a lot of threads on particular models on this site.
I will offer just a couple of other thoughts.
Getting 700 miles out of a pair of trail runners (from the border to KM) is really stretching it, in my opinion (though people do it and get way more miles out of them). I think I got about 500 miles per pair of shoes, generally. I was on my sixth pair of shoes at the end.
I think the one experience I will share is that my feet swelled in the desert from a 9.5 to 11.5 pretty quickly. Unlike the past two years, when the desert was relatively cool (but the mountains extremely snowy!), 2009 had a very warm stretch early in the hike. My feet swelled and pretty much stayed that way for the majority of the hike. This is pretty common, and many people took knives to shoes to cut away hot spots and toe boxes. Whatever you do decide, find shoes that breathe easily. The downside is you end up getting more dirt in your shoes, but airflow helps cut down on the blisters, at least it did for me.
Early on, a lot of people switched out shoes because of hot spots/blisters/etc. if you got a pair now you could definitely make sure it's to your liking and start the hike in those, and replace them down the line....By the time I reached Yosemite, I was in need of a third pair, as the first bit the dust early, the second I received around Big Bear and were shot 1/3 of the way into the Sierra and were on their very last legs as I arrived at the post office in Yosemite.