No. I do want to upgrade, my current machine (13" MacBook Air with 4GB RAM) but even the top spec'ed 15" I feel would only last a year or two before it starts t

No. I do want to upgrade, my current machine (13" MacBook Air with 4GB RAM) but even the top spec'ed 15" I feel would only last a year or two before it starts to feel limited - and I can't justify spending that much if it's not going to last. I'm thinking either a Dell XPS 15" (when they refresh them with Kaby Lake) or keeping this and getting/building a powerful desktop PC.