@ OPer...to help clarify for people, to get the best possible advice (and to prevent more dike-waving between some posters),
1) Is the $1000 limit an absolute? What is your honest "not a penny more" price?
2) When you say you need to have mods, do you mean fixes and gameplay tweaks or hi-res texture improvements?
3) What is your target screen size?
4) Being completely honest, is "don't buy anything" an option (even if most people were to tell you that you couldn't get what you want for your price limit)? Or are you getting a laptop come hell or high water? (I'm in the minority in advising to rethink buying altogether, but your answer to this will help people with specific recommendations, cause they understand your mindset)
1) I'd say, if it was absolutely necessary, I could push it to $1100. But that's pretty extreme.
2) I'm mostly looking at mods that add quests, homes, and items (like
Lost Spires and
Unique Landscapes for Oblivion, I think it was called). High-res textures and additions would be a nice bonus if the computer could handle it.
3) 11' seems a bit too small. I'd say between 13-17 inches, depending on price. I could also try hooking it up to a TV through HDMI when convenient.
4) "Don't buy anything" is indeed an option, I am very much on the fence about this. It's a lot of money. I'm content with the 360, but having played Oblivion with fantastic mods in the past and the upcoming release of the Construction Kit, I know what I'm missing. Mods make a great game incredible, and I've already run into broken quests and items on my 360 that could have been fixed with the console.