I'd go for Stage 4s if you get Elkas. I have Stage 3s on my 450 with +2 Janssen arms and while they can take a hit and are smooth even without being re-valved for my weight or riding style, they only have compression adjustment and that's it. No rebound or hi/low compression adjustment. So if you just want a good aftermarket shock and that's it, get some Stage 3s, if you want a good shock that you can fine tune to your liking then get at least Stage 4s.