How much should i sell this guitar for?

I have an Epiphone Les Paul Studio that i've owned for about 6 months now. It was used everyday and played hard. It has no scratches or dings. It has some wear on the pick ups and the pick guard but thats what those were made to be build to get a little scratched up. I know you guys can't tell much from this but i'd still like to know what you would buy it for or what its really worth. I bought this guitar for 400$ from guitar center like i said sometime in January. I am upgrading to the Schecter Hellraiser C-1 FR