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My plan was to just get the high end 27 non bto but if the 2gb gpu is that little I will probably get that upgrade
 
Comparing those AU$ prices to GBP, the upgrades are:

i5 to i7 = 178GBP
GTX 675 to 680 = 92GBP

These are both a bit cheaper than I thought... in which case I can see I will be getting both!
 
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