Dell Dimension E520 base unit - Looking to swap +

Mint condition Dell Dimension E520 base unit only. Great machine in working condition, hardly been used, currently has Linux installed on it. Looking to swap for an iPod touch, iPad or an old macbook. Can deliver in and around the Exeter area. http://www.tier1online.com/Product/T1*2304640-0000000403?CAWELAID=1441946829