That looks like a Colnago Dream with the 'Flash' fork (carbon fibre blades, aluminium crown and CroMo steerer tube, with the embossed clover on the shoulders of the crown) which would date it somewhere between 2001 and 2004-ish. Nice bikes, and don't be put off by the aluminium frames - they are decent Colnagos.
Can't make out the details of the groupset (non-drive-side photos make everyone sad...) but it looks like Campagnolo, which is a good thing!
At the moment, with the market as depressed as it is I'd say £750 at the most in the UK, but judging by the photo it's not in the UK... so 'sold items' search on
eBay will give you a local equivalent.
I don't think it's a Dream Lux or Dream B-Stay which would sell for about 10% more, so factor that in too.