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You could also try Ludwigia inclinata var verticallata 'Cuba', a very nice orange/pink Ludwigia, or Proserpinaca palustris, an interesting bronze/orange plant, commonly called mermaid weed. They are not very common, but you can find them both at www.aquabotanic.com if you're interested.
I had trouble keeping it looking the way I wanted it. It will only have a few leaves at a time so you can't really trim too much in order to shape it the way you want it. It also likes to send new leaves to the top of the water. You can trim these off - but what do you do when it suddenly sends all of its older leaves to the top of the water too?
But the color was amazing! well worth it in my opinion.
I just picked up some Peruvian ludwigia that looks nice and should do well in your tank. Rotala macrandra would be really spectacular but I'm not sure you have enough light.