Your own routes on a sat nav

[garstead]

I've been looking at sat navs for a while now and read lots of opinions about which types people prefer.
The main priority for me is to be able to easily load routes so that I can drive the roads I want to, not where the sat nav wants me to go (uk & europe).
Which is the best/easiest to use in this manner?
Is it difficult to programme routes?

[garstead]

Thanks for the link Tony, I'll give it a try and use it on one of the garmins at work.
Gary