I'd say just buy it when you can. But you might want to wait until the final version is released. Because Notch stopped grandfathering people in to the future releases after the beta came out (if you got it during Alpha, you're fine though).
Originally Posted by ~Spacial_Rendation~
A Winner Is You!!!
If you spend too much time thinking about a thing, you'll never get it done.
- Bruce Lee
It is amazing that people who think we cannot afford to pay for doctors, hospitals, and medication somehow think that we can afford to pay for doctors, hospitals, medication and a government bureaucracy to administer it.
- Dr. Thomas Sowell