Currently the screen resolution is 1680 x 1050, which I believe is the max for this particular monitor. And no, I haven't been shopping in that time period - computer is still pretty much stock. I think there may be a small RAM upgrade in there somewhere, but otherwise, that's it. Shop brought, pretty much.
I don't really know what the budget would be seeing as I don't know the average prices. I'm willing to leave the actually purchase until Skyrim's specs are released, but I'd like a good idea of the sort of thing to be looking for. Maybe something that I could play Oblivion on in the meantime (mostly so I could get at those wonderful mods, and play around with the Construction Set, as I loved doing with Morrowind
).