Hi Rob - thought it seemed a bit high at £80, but noticed you've got a lightgun etc... and you also have the original 'pack-in' T2 Cartridge, so that helps...
I'd seriously offer postage (at least UK/Euro!) if you want a realistic chance of selling it for close to what you want? - I've sold systems on Ebay and posted them before, and honestly, it's not that much of a big deal to package them up safely, at the benefit of MASSIVELY increasing your interest from potential buyers who'd never be able or willing to collect it...

- Seriously? - you're probably *realistically* cutting yourself off from 95-98% of the potentially interested buyers, by putting Collection Only...
In comparison, I've only had 5-6 people (out of 100's) willing to collect (and got VERY low interest/final bids), for items that I listed as collection only early on mate...
If you use YoDel (but DHL) or similar, via say,
www.p4d.co.uk etc, you can even get multiple large items collected from your address, and sent via courier for £6.99+vat, up to 30KG's, and without this option out there, I dread to think what Royal Mail's costs would have been to ship the same stuff! - One point though - I have had very, VERY bad item/package abuse experiences with items delivered through Sh*ttylink, (and earlier on, with ParcelFarce) so I'd honestly steer clear of those two for fragile items, IMHO...
Well, good luck mate, and all the best!...