From the Walmart bundle

game 1: I'd choose Dead Space (and from the looks of your collection you played Dead Space Extraction).
game 2: I'd choose Uncharted 2, the 2009 Game of the Year (with Batman Arkham Asylum as a close runner up).

But you could probably do better like leo-j suggested and buy from amazon for $299. Lets see... then Dead Space is $19.99 on amazon and Uncharted 2 is $48. Batman is $30. So you could buy 3 brand new games with your PS3 instead of 2 at walmart for the same price.

I would also recommend playing the first Uncharted before Uncharted 2. It's $27 on amazon. Another game I highly recommend is Metal Gear Solid 4, which is a steal at $19.99 on amazon.

Oh and God of War III and Heavy Rain are another two games you must play!! But they just came out so you might want to wait for a price drop. They could also be easily finished in a rental. They are about 10 hours each, but they both have replay value.

I would also recomend

http://www.amazon.com/Metal-Gear-Solid-Patriots-Playstation-3/dp/B000FQ2D5E/ref=sr_1_1?ie=UTF8&s=videogames&qid=1269977476&sr=8-1

http://www.amazon.com/gp/product/B000FQ2DTA/ref=s9_simh_gw_p63_i4?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-3&pf_rd_r=0RVP7090SYP0T9ZZ340D&pf_rd_t=101&pf_rd_p=470938811&pf_rd_i=507846

http://www.amazon.com/Ninja-Gaiden-Sigma-Playstation-3/dp/B001BP4JY6/ref=sr_1_1?ie=UTF8&s=videogames&qid=1269977730&sr=8-1

http://www.amazon.com/Ninja-Gaiden-Sigma-2-Playstation-3/dp/B0029MAXR2/ref=sr_1_3?ie=UTF8&s=videogames&qid=1269977730&sr=8-3

http://www.amazon.com/Devil-May-Cry-4-Playstation-3/dp/B000P297EI/ref=sr_1_1?ie=UTF8&s=videogames&qid=1269977977&sr=1-1

http://www.amazon.com/Demons-Souls-Playstation-3/dp/B002AB7TX8/ref=sr_1_1?ie=UTF8&s=videogames&qid=1269978095&sr=1-1

From the options on the site, I'd recommend:

1. Dead Space

2. Uncharted 2 (although you should pick up the first one and play it first)

if you have kids, I'd get LBP or Ratchet and Clank for the second choice.

Dude, that bundle sucks. :( The "choose first game" section is filled with mostly crap games... Except for Burnout.

based on your collection

Shooter - Killzone 2, Call of Duty: Modern Warfare 2

Horror - Resident Evil 5 (yea, I know it is more action, but whatever ), Dead Space

Fighter - Super Street Fighter IV (out soon, or you could just get the non super version)

Action - Uncharted (1/2) Ratchet (crack in time / tools of destruction), Assassin's Creed (II is supposedly a lot better, but I loved the climbing and stealth in the first one)

Platformer - Prince of Persia, LittleBigPlanet (floaty physics, so make sure you don't mind that as it isn't Mario)

Also, if you are going for cheap, I would recommend a new PS3 for $300, and then any two games used from an Amazon seller. They are blu-ray discs so they are scratch resistant, and Amazon grantees the purchase. Most of the games I listed would cost $20 used, for a grand total of ~$340 which would save you ~$60

Heavy Rain 

Uncharted 1 & 2

Resistance 1 & 2

G.O.W. COLLECTION & 3

Metal Gear Solid 4

Heavenly Sword 

MLB The Show 10 ( If your a baseball fan.)

Bio Shock 1 & 2

Batman Arkham Aslyum

Just a few choices!!! 

Walmart bundle

game 1: Sonic's Ultimate Genesis Collection (PS3)

Game 2: Uncharted 2

Tho i think you should look at Leo-j's links first .

Burnout: Paradise
Uncharted 2

Might I also reccomend that after you get it and set up everything and do any updates you need, to download just as many demos as you can, you have the room, if you've got the bandwidth in your internet connection. They can download in the background, just download a whole bunch of them and try them out later at your leisure.

If you had to stick with the WalMart bundle, Dead Space from list 1 and Uncharted 2 from list 2.