Ps2 or psp..?

im n a confusion of whether to buy a psp or ps2.. nd more over i lost my mp3 player so im plannin to buy one with video option so i think it would b better if i buy psp since it is handheld and with mp3 player options nd i lov to hear songs a lot.. im 80% confident of buyin psp due to these factors, is my decison wron...? must i go with ps2 itself? pls help me out of this.. since i dont know more abt either ps2 nd psp