they are one of the most common, yet most suited wheels to go onto an escort cosworth.

the price you have been quoted sounds very fair, but at that price (and being brand new) id expect the tyres to be a budget option.

the wheels you show are Engels, which are infact a copy of the origonal called Rondell, both are very good but many preffer the origonals.
if you wanted some origonals, then Dave Moss has a very good set for sale with very good tyres for £900.