I always used ruby red, a bright magenta from Schmincke (PR122) but now I'd rather try the recommended more neutral Permanent alizarin crimson, but Schmincke has no "alizarin hue".
Here's the http://www.schmincke.de/fileadmin/bilder/Farbkarten/MUSSINI_Farben.pdf
My first choice would be Madder lake dark but unfortunaly it's a blend of two pigments PR 254/
PV 42 (maybe it is not that bad because both are in the pyrrol family?). As in the pdf described it's a bit brighter than genuine alizarin crimson.
But I've found that Permanent alizarin crimson is often made of PR 179. This would be Florentine red here. But I am not sure if it's bright enough to be an alizarin replacement.
I hope you can help me out here.