Off piste but might as well list them here, too!
1 x Dell PowerEdge R420, Dual PSU, Dual Socket. 1x E5 2407, 4 x 4gb, 2 x 8gb ram, 4 x 146gb 15k SAS. - £175
1 x Dell PowerEdge R420, Dual PSU, Dual Socket. 1x E5 2407, 24gb ram, 4 x 146gb 15k SAS. - £150
1 x IBM x3250 M4. 1 x E3 1230, 16gb Ram...