MY sincere suggestion to you is to either go with the gaming PC or a console like PS3. Quit the idea of buying slim with an average dual core gaming rig in first place. Get one best thing either a good gaming rig or the PS3. Well, if you go with the PS3 then make sure you have a lot of money to spend on buying games. Since, each title will cost you around 2k+ Rs.
If i was you and i had 60k budget, i would definitely go for a high end gaming rig. Its the best value for money. Not just in terms of games. With a fast computer you will get other advantages like cheap HD movies, reliable day to day computing, massive storage etc.
High end gaming rig has far more options (other than just gaming) than a console. Besides you can buy a game pad and then enjoy cheap games from the market.
Here, you should also note that there are few games that are exclusive to consoles. Such as Uncharted is one game i want on PC real bad. So you get some you loose some. Rest assured most of the new titles are released for PC as well.
I am not a fanboy but if you like to spend efficiently, effectively and economically then gaming rig is the way to go.