Klutch sl1's how much are they worth?

[davelarge]

A local guy has offered me some klutch sl1's for a swap with my wheels plus £300 his way, I'd value my wheels between £400 and £500 so in total I'd be £700-£800 on the klutch alloys.

Specs are:

16 x 8 fronts et20.
16 x 9 rears et 17
4x100
Black with polished lips
All 4 with good tyres

I know they are quite hard to get hold of in the UK but what are these worth roughly?

Thanks Dave