Here's what I (think) I know so far:
Colombian Rock - yellow chicks
Red Sex Link - brown "stripy" chicks
Black Sex Link - black chicks
Barred P Rock - black chicks with light caps
I ordered RIR and New Hampshire as well, and the two different chicks I have left are:
2. Brown with a dark line on the head and wing feathers have what looks like black starting
Which might be which? I can't find enough info on what the chicks of each breed look like, and there seems to be no compiled glossary on this site?