The Super Slim PS3's can only be hacked using Cobra ODE, a chip that is installed in your console.
The price varies form 11k-15k for this chip with installation.
PS3 Slim models can be hacked but you won't find a brand new Slim PS3 in market.
Better get XBOX 360 Super slim which is jtagged, it means you will be able to play games on your console without the need of any disc, you can download games on your PC/Laptop and later copy them on your Xbox 360's hard drive and play.
Plus you will get a lot of features and you will be able to customize it. The thing is you won't be able to play online, you'll eventually get banned. However even after ban, you will be able to play offline.
Xbox 360 also comes in LT-3.0+, in it you will be only able to play with a pirated disc(Those 100 rupees wala). You won't be able to play directly from hard drive.
Xbox 360 Super Slim Jtagged one is a better buy overall. 