Thanks for the suggestions people.

How about on the downloadable games side??

I've heard Journey is good.

Journey, Fat Princess, Sound Shapes, The Unfinished Swan, Tokyo Jungle, DCUO Online(Free 2 Play MMO), Flower, Sideways New York, Shatter, Wipeout HD/ Fury, Guacamelee and Rochard.

If it hasn't been mentioned yet, Demon's Souls (it's one of my favorite games this generation). I would also recommend the Ico/Shadow of the Colossus Collection, especially if you missed out on the games during the PS2 era.

I won't have a very original list, as people have already listed some of the best exclusives.
My recomendation list (exclusives, skipping MGS4):
-Uncharted series
-Killzone series
-Resistance series
-God of War 3 and GoW: Ascension (start with the latter) then HD collections if you would like the games
-Heavenly Sword
-Socom 4: US Navy Seals
-Demon Souls
-inFamous series
-Ratchet & Clank Future series
-LittleBigPlanet 2
-Heavy Rain
-Motorstorm series (you can skip the first two and go only for Apocalypse)
-Gran Turismo 5 Academy Edition (dirt cheap right now, you keep you enterntained until Gran Turismo 6 comes later this year)

Digitals in another post.

Digitals only, exclusive:
-Flower
-Journey
-Unfinished Swan
-Sound Shapes
-Super Stardust Delta HD (if I'm not mistaken in the name)
-Wipeout HD/Fury
-Pain
-Datura
-Guacamelee

And upcoming exclusives, worth your attention:
-The Last of Us (14th June)
-Beyond Two Souls
-Gran Turismo 6
-Puppetter
-Rain
-Until Dawn

I'll make this easy.

Resistance Collection
Killzone Collection
Infamous Collection
Metal Gear Solid Legacy Collection
Uncharted 1-3
God of War Sagas
Heavy Rain
The Last of Us
Valkyria Chronicles (if you like strategy rpg's)
Demon's Souls (if you really love difficult + rpg's)
Gran Turismo 5 (if you enjoy racing games)
LBP2
Numerous HD collections you might be interested in.

Yakuza series
Uncharted series
Killzone series
Gran Turismo 5
Little Big Planet series
Infamous series
The Last of Us (out next week)
Beyond two souls (out October)
Resistance series (especially fall of man, epic game)
Metal gear Solid 4
Heavy Rain
Ico and Shadow of the Colossus HD collection

the list is insanely long of amazing games to get on your new ps3 but just look at the game collection under my account. I recomend you rent games or get most used because it's not worth spending a fortune on last gen games when the next-gen begins holiday season 2013. enjoy Sony's flagship uncharted, killzone, and god of war. and in the next weeks/months please get the last of us and beyond: two souls :)

Based on your favorite games id say these are good

- Uncharted 1+2+3.. Action adventures with tons of charm and action
- Okami HD..Since you seem to like the Zelda games i definitely think you should give this one a try. Its alot like zelda with a very pretty graphic style. Its available on PSN
- Ratchet and clank future: A crack in time.. Fun platformer with insane weapons and lots of collecting
- Gran Turismo 5(or rather wait for 6 that is coming out this fall)
- Resistance 3.. A decent shooter with some fun weapons, same developer that did Ratchet and clank. I dont find Restiance 1 or 2 that good, they have aged very badly
- Killzone 2 and 3.. Good shooters with very gritty atmosphere and pretty graphics. KZ 2 is much beter than 3 but have alot of weight to the controls that some have trouble getting used to
- Little big planet.. If you have some friends to play with or like fiddling around in map editors and whatnot this is a great buy
- Infamous 1 and 2.. Decent open world games with fun superpowers

There are obviously alot more great games but judging by your favorites id say these fit the best. Nothing wrong with trying something new tough, in that case you got some great sugestions already. Good luck

Does Australia have the same PSplus deals as Europe?

I'd recommend paying for 1 month to play Infamous 2, Demon's souls, ICO & Shadow of the Colossus HD and Catherine.
(even LBP2 and Motorstorm are still there)