PSP : Should I buy or not?

now, i feel the peer pressure to get a PSP lei. In camp, during rest time, 90% of my platoon mates who have PSP would be busy playing. Either the ever famous : Monster Hunter 2 , or Pro Evolution Soccer.

But i'm afraid tat if i buy den when i go uni i wont use it very often, then very wasted. not willing to spend 300+ on a PSP Slim lei. [ Correct me if i am wrong about the pricing ]

I am quite decided to buy a first-hand PSP Slim. But dun know whether should tell my dad. I think later 
he say wait till offer or IT show - which is in March. 
Have to wait for another month...... 

*updated*

got one of my friend who is "ord-ing" wanting to sell his pink psp. I confirm with him le. he bought from his friend. So if i buy from him 
its 3rd hand. He is selling around $110.

I asked around my friends. One of them said can buy one PSP slim for around $290 after mod.