In reply to Welsh Kate & Heike:
Wee Buachaille - I just seem to remember wading through a series of bogs & peat hags to get to it, seemed to take me hours, although that may just have been me.
Schiehallion is a good shout - fair walk in, bouldery at top
He's been up things like Ben Ledi/Bein an Lochain/Ben Vrackie and enjoys the "scrambly" bits more than bog trotting (don't we all) hence thought Tarmachan Ridge
Ski centre hills - aye, we've been through the ski centres, they do have their own particular charms
May just do a few more corbetts with him this autumn/winter and then hit the heights of munro bagging next spring - as ever, all depends on weather.
Cheers for the feedback though guys, appreciate it.