In reply to J101:
Any of the grade twos from the white book are pretty good. My current work rotation for client friendly grade twos seems to consist of Bastow Buttress, Nor Nor Grooves, Idwal Buttress and Continuation and Seniors Ridge Direct. I wouldn't bother with Idwal Stream... who wants to climb slimy waterfall! Disgusting! The Idwal scrambles have the benefit of not having to walk all the way up the Heather Terrace to get started too.
Idwal buttress is also easily connected to the Cneifon Arete if you feel like your moving well and want to carry on scrambling, or you can finish up the easy top section of Seniors Ridge to get up high.