Widescreen gaming is great... if the game supports it natively. There are hacks and simple file changes but then again it's a pain in the *** when games like BF won't do it because the devs say it gives people an "advantage" over other players. O please, so the person with the $3000 computer doesn't have an advantage over a person with a $1000 computer?
However, games like HL2 and other source games (CS:S, DoD:S, Dark Messiah) are wonderful to play in widescreen.
To put it plainly, if you don't want to bother playing with your games files and stuff (the non-native games) to get widescreen and just play the game then regular is what you would like. But if you want widescreen gaming experience then get that.
This is a pretty good website that talks about it, and game compatibility:
http://www.widescreengamingforum.com/wiki/index.php?title=Main_Page
I went through their native list and pulled some highlights:
Call of Duty 1 and 2
Half-Life 2 and source games (some of the best WS support)
FEAR
Ghost Recon: Advanced Warfighter
Quake 4
Rise of Nations: Rise of Legends
Elder Scrolls IV: Oblivion