Which 360 package should I buy?

So, I've convinced my parents to let me get money out of a savings account for me and let me buy a 360. Which package is best for me? I'll be playing by myself and maybe using XBL. I really just want to play Halo and Gears. Lol. So which of these is the best?

- The $350 one with a 20 GB hdd

- The $280 core Arcade bundle

- The $280 pro value bundle

Please keep in mind that I'm not gonna watch movies or w/e, I just want to play games. None of that downloadble crap, either.

Thanks so much for your help!

So basically I HAVE to get the $350 one with the HDD to play Halo online?Gran_Bruce

Yes.