For support modules, I really like Mutable Instruments Kinks and Links and recently acquired WMD SSF Toolbox which is a really nifty small HP module that gives you summing, rectify, logic, invert and switch utilities in one small HP space. If I need to do heavy duty logic stuff, I use the logic operators in Pamela New Workout and my Intellijel Plog which are lots of fun as well. Besides VCAs and modulation sources, utility support modules are the bread and butter of modular!