I generally want to be able to match RGBs of the banners to that of the usable text colors on the forums, just for consistency's sake. So, I went looking for some different purples. Here's a list of them. If you are able to think of or find any other purple text colours on the forum and think you might like that colour better... perfect! Just make sure to tell us what base colour you used and what its colour name is here on the forums. I hope this doesn't sound like an unreasonable request (I'm a huge perfectionist).

DarkOrchid
Orchid
Purple
Plum
Indigo
DarkSlateBlue
SlateGray
Navy
Lavender

P.S. my personal favourite is Dark Orchid c ;