Save space in a Nuvi

Doug,
how does the Nuvi perform as an off-road GPS? I am really tired of peering at a tiny screen (Garmin 60), but living in West Africa there is sod all use for turn-by turn voice prompts etc . Have been looking at the 276 plotter type, but you can get a bigger screen for less with Nuvi type and it doesn't have to be waterproof! All I really need is to be able to up load wayponts and tracks, and the usual GPS stuff like headings, marking and creating tracks. Basic garmin world map actually not so bad (at least in the 60c) for my uses.
Would be interested in your views,
Gil