For $650 you`d be struggling to get a decent 19" gaming TFT.
In case you didnt know, TFTs arnt like CRT, the size quoted on a TFT is the actual screen size. So a 17" TFT is the same size as a 19" CRT.
You could get a very good 17" TFT though for that price. Try something like an Hitachi CML174 Series. Its excels for games, due to its 16ms responce time, and responce time is importent for games. It also has DSUB & DVI.