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There's one game that nobody has mentioned yet: XCOM: UFO Defense (also known as UFO: Enemy Unknown). If you like the strategy, team building aspects of Baldur's Gate, then you will love this game. It's in my top 5 of all time favorites and considered to be the number one game of all time for many ranking sites.

It's really hard to find for sale now, but you can possibly find it for free on an abandoned-games website. If you can get yourself a copy, there are a few excellent mods for bug fixes and some cosmetic improvements.

For mods, I highly recommend:

*XCOM Enemy Unknown CE: fixes lots of bugs
*MP3 Music Patch: Imports the music from the Playstation I version (much better than the original PC music).
*D3DWindower: This is a great utility that can run lost of old dos games in a window on your desktop.
*Alien Voice Patch: Restores the original, scarier alien scream sound.

Get the mods/utilities here.

Overall, if you haven't played this game, you are really missing out.