well, you have a great varmint gun now. The other question you need to ask your self is how far do you want to be able to shoot. if you can find yourself a decent action at a good price, 2000 is a doable number. I suggest looking for a used Tikka, Savage, Remington in the action size for the caliber you want to build.
Then start picking the brains of the great guys on this site and you are on your way to the great world of long range shooting and the intense world of load development.
Good luck, and have fun.gun)