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(And I don't have a gamecube, so nobody tells me to get mario, or wario, or any GC game)
I'd obviously strongly recommend Jak 1, but you won't get exactly the same experience with Jak 2. Therefore liking Jak 1 shouldn't necessarily serve as an incentive for getting Jak 2. They're really quite different.
If you want a Jak of all trades, but a master of none then go for Jak 2, Ratchet and Clank or Ratchet and Clank 2. By no means bad games, but too many GTA-esque elements and gun-toting detracts heavily from the platform experience into some kind of shoot-'em-up which really isn't that fun.
It's Jak and Daxter: The Precursor Legacy by far.
Jak 2:Renegade
Ratchet and Clank 2
Ratchet and Clank
Jak and Daxter:The Precursor Legacy
Beyond Good and Evil
Sly Raccoon
Whiplash