Pretty sure Fox sells a kit to update to the /2 spec. That's got to be a lot cheaper than a set of shocks.
Valving is no big deal, either will likely need that done if you want them right. As mentioned, the big deal is with the air volume remaining as the shock approches full "up" travel. If you want to run the more commonly used "woods" set up, the front end runs kinda low, so you see/feel the effect of that shock running near the top of it's travel (harshness) more frequently than somebody running a tall front end/lots of initial air pressure (50psi+). The /2 spec. smooths a lot of that harshness for you, and if that kit is installed at the same time you get some valving done(progressive valve stack!) you'll see/feel a whole new front end working for you!