PC Fair !!!

Yay!!! Today is PC Fair.... n as usual i went there for a walk... Juz to browse for things that caught my eyes... But there's something that i particularly want, that is an external hard drive... which i think is convenient to me... Coz i have lots of media downloaded but no space to save... The external hard drive cost around RM220+ for a 2.5" 320GB, n around RM250+ for 3.5" 500GB.
Now that lead me to a dilemma... Which 1 should i buy? the compact n portable 2.5" or the big n bulky 3.5"?...... I really dunno.... The price is almost the same, but the storage they have is totally different...
Argh!!! I dunno... But before thinking all of these... There's another important question, will my parents allow me to buy 1st? To buy or not to buy, that is a question... to be answered by my parents... (=.=) Well anyway today is only the 1st day, no worries... Let's juz all hope that my little wish will be granted...