Tekken rules. It's multiplatform now, but I still associate it with Sony platforms.
Seconded, though I won't lie the Wii-U version with the Nintendo stuff and lack of online pass is tempting. Been thinking about getting it despite already owning OG Tag Tournament and Tekken 3. Feels like those 2/3 games are the minimalist method of getting the best Tekken experience, and it's roughly one entry per generation, though Tag Tournament being a launch title(And on compact disc!) is kinda pushing I guess. lol
I remember my friend having lots of fun with Tekken 4 though; I remember it being alright but we usually just played Tag Tournament or 3.
Anyway here's a rough draft of my PS2 collection;
Ratchet & Clank 1-3
Ratchet Deadlocked
PS2 ports of the Ratchet/Jak PSP games
Katamari Damacy & We Love Katamari
Jak Trilogy
Jak X Combat Racing
Sly Trilogy
Crash Bandicoot 4 GH (Also own on Xbox, this version is more for collection's sake... though because I play PS2 more often than 360 it ends up being played more anyway)
Crash Twinsanity
Crash Nitro Kart
Spyro 4 (For collection reasons I assure)
Spyro 5: A Hero's Tail
Mega Man X Collection (Mega Man X7 shares the same real estate because fuck X7)
Mega Man X8
Klonoa 2: Lunatea's Veil
Final Fantasy X
Kingdom Hearts I & II
Kingdom Hearts Re: Chain Of Memories
Okage: Shadow King
PaRappa The Rapper 2
Ty The Tasmanian Tiger
Super Monkey Ball Deluxe (Also own on Xbox)
Dark Cloud 1+2
Ape Escape 2+3
Ape Escape Pumped & Primed
Monster Rancher 3+4