Sword plants don't require much more than low light to grow well. If you have them at around 30-40 PAR they should do very well. You could use a 2 x T5HO, Catalina light, http://www.catalinaaquarium.com/stor...oducts_id=1842
suspended about a 6-12 inches above the top of the tank, to get that light intensity. Then, you could dose just Flourish Excel, and use either ADA Aquasoil or mineralized topsoil, topped with pool filter sand, black diamond blasting grit, or Eco Complete as the substrate. Dosing the water with NPK and traces would be helpful, but not essential. Sword plants do get nutrients from the water as well as from the roots.
You shouldn't want the sword plants to grow really well, or they will very quickly completely fill the tank. Just slow, healthy growth is what will work best.