From these games which would should I get (only getting one):

Ratchet and Clank, Uncharted, Devil May Cry 4, Burnout Paradise and Folklore.

Which one?!?!?

Those games have almost nothing in common, for proper advice you may want to give some reference.  Such as games you have enjoyed in the past or maybe even an little blurb that relays your play style to us.

Which genre of games do you prefer to play the most?

"Those games have almost nothing in common, for proper advice you may want to give some reference.  Such as games you have enjoyed in the past or maybe even an little blurb that relays your play style to us."

Burnout Paradise. I played it, it's awesome.

I'm an all rounder guy. I'm into having a deep single player experience but won't mind online aswell. I want an experience on the lines of MGS4 if that's possible.

Form those games you will not get an experience like MGS4 (actually you probably couldn't get that from any game ^_^)  But I am going to suggest Uncharted to you, cause out of all of those the story seemed to draw me in the most.  Best of luck on your decision.

I'm saying Burnout

Assuming you already have MGS4 and going by your list... get Uncharted and Ratchet and Clank, those have good single player.

Uncharted has an awesome single player. Definitely recommended.

Uncharted is probably the most similar to MGS.  But Paradise is probably a little better, plus it has great online.

Ratchet and Clank: Tools of destruction. 

I would pick Burnout Paradise. I think it's the best game to purchase and it has the most replayability. Uncharted was a pretty good game, but purely a rental.

How long is Uncharted? I might rent that and buy another game.

Rent Uncharted--it's fairly easy and straight forward enough that you should get through it no problem in two sittings, I did. Definitely buy Burnout: Paradise--its single player is great and its online is a blast.

DMC4, amazing.

ratchet is a fun game that can have decent replay value if youu get into it.  dont know much about folklore but i know im going to rent it soon enough, it could be a decent rpg.

like others have said it really depends on what type of game you want to play since the ones you list all provide something different.

I would recommend Burnout Paradise for purchase.  The others are great rentals, but the only one on that list that I think has enough replay value to be worth owning is Paradise.

"Ratchet and Clank: Tools of destruction. 

reasons: 

1. Tools of Destruction is a really well made and fun game. 

2. The "Quest For Booty" expansion will be out this summer [Quest for Booty will be sold on the PSN as a stand alone title for 15.00]

3. I'm a Ratchet and Clank geek so what do you expect! 

good hunting. "

Uncharted is the funnest out of all of them, but it's only about 10 hours. Paradise isn't as good but there is alot more to do. Try to get Uncharted when it comes to "Greatest Hits". It'll be $29.99.

Uncharted, it is the best game on that list.

Get Uncharted.

However, I recommend that you buy Oblivion GoTY if you don't own it already.... trust me on this.  You will definitely be getting the most back for your buck considering how many hours you can get out of the game!