In reply to lex:
Where are you starting from and returning to?
I've carried skis up Angels Ridge, and it was OK. The descent from the top of Angels Peak to the col between it and Cairn Toul is a really easy ski. If you've got skins, you shouldn't need to carry the skis up Cairn Toul.
The descent from the top of Cairn Toul into the Lairig Ghru is superb down the east facing corrie (Coire an t-Sabhail), and then down the stream line. Given the temperatures, it's likely to be a bit on the firm side though.
Another really good run is into Coire an t-Saighdeir from the South Summit. It faces south, so you may find it sun softened If it is, it's really, really good
I suspect cover will be good enough that you don't need to worry too much about following the stream line closely.
This may help:
http://www.steepscotland.info/CairnToul.cfm