Street Nav for offroad?

 

was hoping I could get some input on which unit might best serve my needs. I have a C330 for my company demo, but am now interestedin getting something for my personal play truck. I go offroading somewhat frequently & would like to be able to load topo & other trail maps for offroad use. Basicly a mix between etrex & road navi. I've been looking online, but would rather get a recommendation from someone who knows.