I use grid connectors and zip ties, but to get the zip ties a secure as possible, I use a zip tie gun thing.
You can get them from a lot of places online but also at electronics stores like Fry's.
This is the exact one I have:
But there are tons out there that will perfectly tension and then most will cut the zip ties for you so you don't have to worry about the security factor.
Cable Management and Wire Organizer Products from CableOrganizer.com has a lot of different options for them.
