There's loads Pebs - Off the top of me head, there's all the Dunnideer stuff for a start - too many to list here (mostly ruined) - see big papery TMA - chapter in the 'white pages' about Aberdeenshire.
But below are the real 'quick wins' for limited time etc:
Fairly near Inverurie - Balquain http://www.themodernantiquarian.com/browse.php?site_id=184
Very near Inverurie - East Aquhorthies http://www.themodernantiquarian.com/browse.php?site_id=188
IN Inverurie - Broomend of Crichie henge & stones http://www.themodernantiquarian.com/browse.php?site_id=263
Loanhead of Daviot's not far off http://www.themodernantiquarian.com/browse.php?site_id=189
Have to say IMO the photos don't do any of em justice ('cept Balquain mebbe)!!!
ENJOY
love
Moth