looking to buy a laptop at the end of the year

I'm lopking to buy a laptop at the end of the year, i'm going to spend roughly around 800-1000 on one.

these are the main things im going to need

1. I want it to last me for a good few years (6-7)
2. I want it to be fast (i hate waiting for applications to load and for it to start up)
3. I only really play football manager so i want it to be able to run football manager and a very good speed, i also want it to be still be able to run football manager at a good speed in 4-5 years time.
4. largest screen possible

any ideas what i should be looking at?