I'm looing to sell my epiphone les paul standard and I have no Idea what a fair price is. It is the standard ebony colour. I've replaced the pickups with SD blackouts, and i've had the neck satin finished. Its in great shape and sounds killer, I'm just not that interested in metal anymore. Any help would be appreciated.

The upgrades won't make a great difference on the price. If you've still got the original pickups, I suggest putting them back in and selling the Blackouts separately. Even so, there are so many LP Standards in Ebony on the market. I used to have two, both cost under £150 each and one had a Bigsby trem on it.
New STD price is $399. If in great shape 250-275 should be fair. \yes remove the PUs and re-install the originals.
Moving on.....