My choices would be:

1)Get Fallout 3 DLC
2)Get Mass Effect 1
3)Get Mass Effect 2

fallout 3

If you were lucky enough to have bought these games from a store that has a "return game within 7 days to get your money back" Then I suggest you play GTAIV immediately

if you haven't got ME 1 , get Elder Scrolls Oblivion.

I played the first Mass Effect, I'll be moving on to the second one once I'm done with FFXIII

But I'm still going to recommend you get GTAIV because it is one of the greatest games of all time. It's absolutely essential that you play it through at least once as a gamer.

i'm not sure about the prices of games in brasil,but gta iv should be kind of cheap as its been out for ages,so maybe you can get a couple,

why do people say gta iv is shit,its not,play it if you haven't played this type of game before,especially if you like driving around,i know i do

I saw some reviews and saw youtube videos... but didn´t felt "ok"... is the history cool as Fallout 3?

Elder Scrolls are the best WRPG series ever made.

but its all a matter of taste, do you like Lord of the rings type of theme?

I never played Lord of the rings. .. good?

As ppl are saying, ME1/2 is really inteersting and GTA IV there´s not soo much pointing to it.. (strange!)..

thanks!! I am understaing better the differences and "pros´"

Lord of The rings as the movie.
you know Swords and Shields orcs and magics

thats Elder Scrolls

Fallout is about guns , nukes , ruins , apocalypse