I secretly desire your console!

I will second the vote for quite a few games.

God of War -- If you really want a good action game with a great story and awesome visuals, God of War really is your best friend.

Ratchet and Clank -- Four games, three of which are $19.99. The first three are platformers with an emphasis on gunplay and sheer hilarity. The fourth game is gladitorial combat with an emphasis on platforming -- sort of the other way around, but still has some humor in it. You don't have to play them in order by any means, although each game does often reflect back to a previous title, such as cracking a joke about a past character.

Sly Cooper -- Three games. The first Sly game is the one that brought me back into platforming. All three games bring their own unique twists on platforming and they're just outright fun. Even their stories are deeper than one might suspect. The Sly games are must-haves for any PS2 owner. These are slightly sequential, if for nothing more than character development. The first game gives a much more detailed explanation of the gang's start, and the other two games build from that.

A surprising twist!

Jak and Daxter -- Four games are out now. The first was a near-PS2 launch title and a ton of fun to play. Jak 2 is a bit of a departure from traditional platforming and from the first game in general; difficulty is ramped up (the first one was a bit easy), GTA-style openness was included with you being able to choose what missions to do. You can even steal vehicles to get there. Jak 2 also introduces gunplay into the series. Jak 3 tweaks the difficulty setting a bit to find the right balance, introduces vehicular combat to the series and expands on the gunplay variety. This is a trilogy of games, so it's basically essential to play these three in order both for story and character development. Jak X: Combat Racing is the 4th game, but don't mistake this for a crappy Crash Kart Racing title -- it's a lot more fun and has a bit of continuity with the three previous titles regarding its story.

Zone of the Enders -- Currently only two games and one GBA title, Zone of the Enders does mech combat right. Zone of the Enders 1 is a great title on its own with only a few flaws, but ZOE 2 is an excellent sequel. Explosions are a lot of a fun and combat is quick with plenty of movement and action. The controls are also extremely easy to use for a game that moves so quickly and uses every button on the Dual Shock 2, including the L3 and R3 buttons. You don't necessarily have to play the first game to play the second, but if you do you'll recognize characters from the first game in the second and have maybe a little better understanding of the situation.

ESPN NFL 2K5 -- If you were going to pick up another sports title, NFL 2K5 is the one to get. It's cheap as hell now, especially used, and it's superb. It's better graphically and playability than Madden 2005 (and arguably Madden 2006) and just a lot of fun to play. Decking out your apartment with all sorts of cool furniture, posters, TVs, trophies, and tabletop games is also really fun.

Jam it back in, in the dark.