This a nice rig, pricey Graphic card which does pretty well and only problem about it is the price (some would say its not much better than a GT.. I wouldn't know anyway).
Pretty good CPU for single-threaded games, should do well also.
I don't get the deal here, why get 4 sticks of 512 and not two of 1gb? would do better if it was two sticks @ 1gb each.
nice PSU and dvd writer, and I don't know much about that monitor.
the case is alright, but I learnd a little and found out that the xaser family isn't as cracked up as its supposed to be, too over priced in my opinion as I owned one for very short while and then replaced it to my current case (Which im extremly happy with) 3D Aurora of Gigabyte. (Much bigger case, much more silent, better quality and better for cable managment and best of all --better price for the BANG! though airflow could be a little better though)
Anyway I think that you'r rig is a pretty good one, I believe it will run oblivion on high settings but i dont know if all can be maxed out.
In my opinion you'r going to enjoy this rig in games in high settings for at least a year or year and half (might even survive two years on high settings) then on time when DX10 cards and other multi threaded games become more popular you might be forced to lower the settings on such games, but we're talking about a year - two years from now... till then I believe you should be able to max out almost every game, ALMOST though.. as I know games that you will never max out no matter what tech you got