A DIY friendly system and the programming language on the ISY is easy to use and quite flexible.
I have been very happy and wish I had done it on the old house.
#2 favorite thing (actually probably #1 but it is not really a remodel item) is a whole house Sonos system. The perfect audio sync and ease of listening to anything anywhere in the house is great. I used to be a developer for GiantDisc (which still has the best cataloging system available anywhere) but the Sonos ease of use and perfect audio sync won me over.