Selling your lenses

I've just got a D600 and I also have a D7000 now serving as a second camera.

These are the lenses I have
Sigma 10-20mm (DX)
Nikon 10.5mm fisheye (DX)
Nikon 17-55mm f/2.8 (DX)
Nikon 35-70mm f/2.8
Nikon 105mm f/2.8 macro
Nikon 70-200mm f/2.8

I think I'm going to buy the Nikkor 14-24mm f/2.8 and I may also get the 24-70mm f/2.8 if I can get them both for a good price second hand, but to partly fund them I'll have to sell the lense(or lenses) that they replace (probably having to sell the 17-55 DX and the 35-70 if I get the 24-70).

Question is how best to sell them.

Ebay takes a 10% cut, off a £600 lens, that is a lot of money, also would paypal take a cut too?

Are there any good alternatives, how do you sell your lenses?