Which (simple/cheap) SatNav (UK & US)

[Zumbruk]

Doubtless this is a FAQ, for which I apologise.

I need a portable satnav which is (easily) capable of having maps for the UK and the Eastern USA loaded into it - perhaps by swapping SD cards or similar. I would prefer not to have to connect it to a PC to do this. I need no other features; I don't need (another) phone, I don't care about traffic reports, I'm not *that* bothered about speed camera locations (although that would be nice.) It must be easy to operate - I'm a geek, but my wife isn't.

I've looked at the "What Tom-Tom" page and now I know how people must feel when I talk about computers - I have no idea what most of it is about. Would I be better off, for example, buying a cheapo UK-only one (especially since I have a Satnav built in my Discovery, which is stuff-all use in the other car(s)) and a cheapo US-only one?

[Zumbruk]

"Please note: this is a revised unit and doesnt include an SD card as the maps are preloaded onto the unit"

No use to me. Sorry.