Detail and quality of ground textures

Hi. I finally got my fsx running quite satisfactory this afternoon after weeks of different tweaking-solutions and a couple of reinstalls. The only "problem" left is to improve the detail and quality of the ground texture at greater distances from the airplane, hopefully without killing the present performance.What kind of options is there for changing the detail and quality of the ground textures? And is it possible at all to get good quality and sharp textures when looking against the horizon or is a blurry landscape just a fact?Both tweaks and normal FS-setting are welcome.Asus P5GD1P4 3.4 ghz2gb ramAti Radeon X800Xt 256 MB300GB SATA HD