Gerald, of them all, Erythrosine is quite good as long as you use the right methodology to incorporate it. It is also inexpensive due to its use in anticeptics and as a food coloring agent.
The method of addition to an emulsion varies with the type of halide, whereas the other commonly used dyes are all added using a common method. This is the major problem with Erythrosine and I have worked out two methods of addition for it in two types of emulsion that give good sensitivity.
I have posted the spectral response of a Br/I emulsion here that uses this dye. It is the ISO 40 film (or ISO ~200 paper negative) emulsion in another thread.