Oblivion

I've been playing the game on a p4 2.5 ghz 1024mb ram, geforce 6600GT on medium setting but without shadows just fine, with little to no slowdowns in fps.

It seems I've just completed the dark brotherhood quest line. To be honest I've been enjoying the mages guild quest line more.

Spoilers in response to Chrusers story:

With the family killings, I didnt like what happened when I killed the older man and his gaurd in the inn way out in the forest. I dont see how the gaurds in the imperial city would know I killed a gaurd way out in some deserted place... Because, like you, I was immediatley confronted upon entering the imperial city. That really annoyed me. But other than that its a nice quest. Also if you enter a house make sure you are undetected (sneaking with transparent eye to show you are not seen) Otherwise gaurds will always know you got in and will come after you.

i have never played any of the old morrowind games, but i want a new game to play and everybody says this is good, would you still suggest it to me?

If your computer can handle it.