My pc:
i5-3570k overclocked
8gb corsair ram
phanteks case
evga 650w gold psu
hyper 212x
asus z77 mobo
 About £250
 -Trades current pc (worth about £140) + sells wacom £50 + sells old pc £40  = 250 - 140 = 90   50 + 40 = 90  90 - 90 = 0    0 money short


New mobo+ram+cpu:
cpu £150
mobo £50
ram £60
 About £260


 - Case + psu 30 + 260 = 290 for all.
sells pc for 200 so 290 - 200 = a loss of 90
wacom + sold pc = 90
90 - 90 = no loss

a6                           a6                           (intel i5) 150
a88xm mobo                   a88xm mobo                   (new mobo) 50
corsair case                 (new case + psu) 30            (new ram) 60
vs 550 watt supply            120gb hdd                    vs550watt psu
1tb hdd                                                    1tb hdd
8gb ram ddr3                  8gb ram ddr3                 corsair case

                               200                               150+50+60+30 = 290                   £90