There were many versions of the classic space combat/trading game, Elite. The best, though, is arguably Elite Plus on the PC in VGA. Made by Chris Sawyer of Realtime Software in 1991.
A different CGA version was published by Firebird in 1987, but this enhanced VGA version is the one to find and play.
Made in MS-DOS and featuring nice, colourful graphics, and the fastest filled polygons of the day, Elite Plus remains the best version of Elite to play as of the time of writing. According to me. 🙂
See also: the sequel Frontier: Elite II.
More: Elite Plus fan page