It really depends on what you feel is a good deal. Conidering what you're going to spend, I would build a box and bang together 4 of these:
http://www.aquacave.com/24-two-lamp-...lvue-1144.html
You may not start with the bulb combination you were thinking but you'd have bulbs already and could change them over at your leisure. All for around $400 US.