i would find another $100 and buy this:
Intel Core i7 2600 3.4Ghz 8GB 1TB Desktop Computer PC
3.4GHz▲8GB RAM▲1TB SATA 3 HDD▲DVDRW▲CARD READER▲USB 3.0

$600 from ihub and free delivery.
this machine would last you comfortably 5 years+
Ebay link:

http://www.ebay.com.au/itm/Intel-Co...#ht_6700wt_1139

There are a couple companies selling pc like this on ebay, i have bought 2 from PCMEAL in the past few months no complaints.

hi shaun,
yes i have purchased a couple off PC meal over the years and i find them quite good.
we purchased the desktop from ihub in September.
fully tricked up with 21" monitor, upgraded chip and 12GB ram etc it was about $1200.

These are the cheapest PC anywhere, i have checked PC meal they are proper pc shop in Sydney, you can buy direct from them if you go there.