Price Check on my GT

I might be selling my GT and I want to know what and if it is worth something.

GT= xChieF IZZ SiKx

has 280 MSP

expires on 5/6/2012

has a CoD elite premium subscription

7425 GS

all legit cod prestiges

Cod4= 6th
WaW=9th
MW2=10th
BoPs=15th
MW3=15th

Halo 3 = 48
Halo reach = Legend

Has all map packs for previous cods

all map packs for Halo's

the arcade games i have are
Trials evolution
Trials hd
Uno
Marble blast ultra

Actual xbox games are

Civilization revolution
Army of two


I was just wanting to know what kind of a price could be on this gamertag