Hey guys what's up?
After a few months saving some money, I finally plan to get a Xbox 360 Premium this month! However, I'll only be able to play at my living room, without Internet connection at least until I buy a Wireless Router and possibly a Wireless Internet thingy for the 360, unless I can get a way to make the router look nice in the room

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Anyway, with that in mind, I also have a budget to buy a few games, mostly used (I live in Brazil, so a new game here costs around US$ 97,00...). What 3 games would you recommend as must haves with a solid singleplayer experience at least until I can get live?
I was thinking of:
1- Fallout 3: the reason I wanted a 360 in the first place!
2- Mass Effect: I've been wanting to get this one for a while also
3- Forza Motorspot 2 OR Burnout Paradise: But probably Forza, I'm more of a simulation type of guy.
So, any ideas? Remember, these games need to last me at least 2 months, without online. Now, no Oblivion please, I've played Morrowind and it never clicked with me. Thank you in advance!