Is joining a club out of the question, skyb? I'd agree with scale that 2000x500 feet is a decent sized flying area. My club's runway is 600 feet and I'd say I fly about that distance beyond each end of it when making a big lazy pattern. I could fly in a good bit less space, but when you have it you use it.

The other thing to think about though is the maintenance. Having a usable grass runway requires a lot more than designating a flat spot and mowing it.