Here are the E2140 and E2160 as well as the E2180 I mentioned before from SCAN.
E2140 http://www.scan.co.uk/Products/Produ...oductID=600159 = £42
E2160 http://www.scan.co.uk/Products/Produ...oductID=600158 = £48
E2180 http://www.scan.co.uk/Products/Produ...oductID=632059 = £58
Which I guess puts the E2160 in the best performance for value seat.