What lights should I buy for my green screen?

I need to buy some lights for my greenscreen, and they need to be less than $200. Here are 3 options I am considering.

-the set of 2 umbrella lights here

http://store02.prostores.com/servlet/tubetape/the-121/Cool-Flo--dsh--800/Detail

-The set of 2 softbox lights here

http://www.backdropsource.com/Productinfo.asp?id=3053&pname=complete-studio-economy-softbox-kit

Or one umbrella light and one softbox light from these 2 places

http://store02.prostores.com/servlet/tubetape/the-119/Cool-Flo--dsh--100/Detail

http://www.backdropsource.com/Productinfo.asp?id=3102&pname=50cm-x-70cm-economy-softbox-with-85watt-fluorescent-bulb_stand

What do you think? If you have another suggestion please tell me. Thanks for any help!