Alright I'm going to list the games that I've played but other than that start naming any of your favorite games that you think I should try out.
I've played: Both of the Witcher Games Baldurs Gate 1 & 2 All of the Elder Scrolls Games (I don't know why but I just can't seem to get sucked into Skyrim like I did the other Elder Scrolls) Damn near all of Valves games. All of Blizzard's Games. I'm getting Freelancer tommorow.
There's a ton more but I'm to lazy to post them all so start naming some games that I would enjoy. They don't have to be in any certain genre I'm pretty much open to anything right now.
More aboutreccomend games
Freelancer is good, loved that game back in the day.
Try the Mass Effect series, excellent story-telling...possibly the best since the Baldur's Gate series. You may also like the Dragon Age series...not as good as Baldur's Gate but a cut from the same cloth.
I'd also sign up for Steam, if you haven't already...you can get some good deals on there, and they have a large collection you can browse.