Just make sure you buy a new one next year (Maybe at a lower price??). Muramasa and Mad World look utterly fantastic.

Resistance 2 seen as you own the first one.

Also, I'd recommend LittleBigPlanet to almost anyone, the game is that damn good, and seen as you like Ratchet I'd say it's probably down your street.

Edit: do you own GTAIV? You don't have it listed in your game collection but you own pretty much all the previous versions. I'd be surprised if you don't have it but you could give it a look.

I own GTA4 for the X360. I'll see about Resistance 2. I was luke warm on the first one.

The PS3 exclusives in my collection that I recommend are:
LittleBigPlanet
Uncharted: Drakes Fortune
Resistance 2

Multi-platform games I've purchased (recently) on the PS3:
Silent Hill: Homecoming
Soul Calibur 4

Resistance 2, best shooter on the ps3 now, highly recommend that one, best game i play since MGS4 (get MGS4 if you haven't yet). if you want a racing game get Motorstorm Pacific Rift, if u like creating stuff (being creative) get Littlebigplanet where you can make your own maps, have hundreds of tools to work with, and publish it so ppl around the world can play your map.

if u can get them all, note i only mentioned ps3 exclusives

Go ahead and get R2, its worth it and fun. Ratchet and Clank QFB...not as fun as future, but still a blast...LBP is more than worth, esp if you have a girlfriend/wife, Uncharted of course, Heavenly Sword if you like DMC, Warhawk is about as fun as you can get online, PSN: Echochrome, Pixel Junk Monsters are fun