Recomend some good starter kits/ Accesories

[Cloud]

Just got my Slim Blue PSP yesturday, got it modded. Now i am in need of some accesories, I would like to get a USB data transfer cable, Car charger, Earphones, a case to protect the psp one that I could slip into my pocket and use it like an ipod while walking around, or working, a portable theatre system that will hold the psp and has speakers and can fold up not big just portable, then a case that can carry it all

Any ideas on what to get for this stuff, dont want to spend too much money. But I would like to see your guy's ideas