hi dude. saw your post in latest purchases. I too, just bought Steel series siberia V1 headset , same white color. Using it with onboard sound card. How is the Steelseries USB soundcard? Does it improve the quality when paired with V1? if yes, what are the improvements did u notice ?
i dont have in depth info abt hacking e1004 cos i have a 3004. this site likely has cfw for e1oo4 http://psp.dashhacks.com/downloads/psp-cfw-660-pro-b9-fix1
custom firmware for any psp is associated with a model no. in E1004's case its "11g"
cfw with 11g listed in supported versions should be cfw to hack ur e1004
I bought the Thermaltake e-sports Shock Headset from Flipkart.com for Rs.1970.
It's an awesome gaming headset considering it's price and the performance it offers.
Look out for more options on Flipkart itself, it has a great variety.