Wikipedia tells me that greed is an inordinate desire to acquire or possess more than one needs, especially with respect to material wealth.
Currently I am greedy.
Currently I have an inordinate desire to both acquire and possess an iPad 2, 16GB, with WiFi (no colour preference stated).
I don't need one. I don't have to have one. I just want one to expand my material wealth.
Sadly my material wealth doesn't cover the cost of one. To put it bluntly, tough shit, Dizz. You can't have one. Get thee back to lusting and stop price comparing them as if it might actually happen. Bad girl. Bad. Naughty.