Looking at the website most maps are downloadable and 500 compatible -but you may need a microsim to hold the extra data. You may not get some of the advanced features like 3D buildings and detailed turn off advice with a new map for a different region. If you have native maps for your region, the lifetime updates is the best way to go I think and these should give you the special features. (I'm in the same situation right now as I have a PAC Garmin -which I could sell to allow me to replace with a UK one now I'm UK based (PM me)...)
HTH
Moreflaps