IMO its going to be hard to find decent lighting for that tank because of the shape and gallonage.
If you were to get 2 of these
T-5 fixtures, you would have 56watts over the tank, which would allow you to grow a good variety of plants. Each of them has a Colormax bulb in it which looks pinkish....not sure if you'd like that or not. It would be just under your budget though.
A
double fluorescent fixture with 2 15w bulbs would give you 2 watts per gallon and would be better than what you have now. It would work for the plants you have now.
The sword plant is the only one that is not going to do well under your current lighting. If you would just rather get another bulb, try to find one in the 6500-8000K range and they are more pleasing to the eye.