Well, I bought the same thing I'm very happy with my decision. Remember that if you need money, you can always sell it. Plus, you'll be able to use it for AT LEAST another 5-8 years.
I never really cared too much for the AC games, but I really like Unity. If you like it, keep it. Life is too short to be cheap. If you wanted it for the games you could buy, then just buy those games. We could play together some time. :)