Some might suggest get a FF body and a economical 50mm f1.4. [ bokeh on 50mm shd be creamier than 30mm due to focal length ]..
But going FF means I'd have to pay for pricier 16-35 and 24-70 [ currently on efs 10-22 and 17-55is], I feel that i am v happy with the 2 efs lens that is very well made for the crop sensors.
That being said, one day when 5Dmk2 drops to about 1.5k, i will still buy........hehhehe
Actually if you already have good lenses and not really a pro you don't really need FF. Going FF will just mean spending more money.
However the price of 5D2 is dropping rapidly and I am already seeing people selling at 2k so 1.5k is not that far off.