Made the decision though, and went for the silk laceweight. This is it after a few rows, full of stitch markers and section markers.
It's Faceted Gems and is progressing nicely. At least it was until this morning when Fee's Boyes needle separated! I thought the left hand bit had got a bit light, looked down and the point had come off, letting the end of the row slide off the rest of the needle. Fortunately it was only the last 16 or so stitches and I think I've rescued it. Was not happy at that moment!!!
This is a few rows and many hours on from the first picture.
Another pressie from one of Fee's friends, Sobe. Thanks Sobe. I haven't decided yet which sock pattern to use, but it will be interesting to see how they turn out.