You could also do it with a half dozen heavily diffused, 1000w, 18″ scoops. At about $150 apiece (probably less on ebay) you’d be able to do it really inexpensively.
On the flip side, four 4′-0″ x 4 lamp Kino-Flo’s would be really sweet (and brainlessly easy)…. but pricey.
DS