Fallout 3 - with additions from ideas of ?Van Buren. Keep it in the old camera view perspecttive - or allow the camera to see from different side - not different camera angle and such
X-Com UFO: KEEP the gameplay same! No new stuff - except few new guns! NO MORE - nothing! Also - keep the old bugs
And yes - the graphics should be modernized.
C&C Renegade:Good graphics and maybe a little common sence(Make the videos look a little normal