Best gps/sat nav?

Hi regards travelling to Bulgaria what Sat Nav or gps covers the country, I recently bought a sat nav that does all around the bordering countries but not Bulgaria or Romania?
I have considered a Tom Tom, I saw some that do full European mapping, has anyone used one and if so did it do the job? I think mine only covers around 70% of Europe although it will set to talk in Bulgarian which is ironic!!
Anyhow all replies welcome in advance.
Cheers Steve.

I have a Garmin NUVI 3598 LM. It works fine in the whole on Europe, it's fine in Bulgaria.  Even the traffic redirection works. My advice is get the best, not the cheapest.

Hi, I have a TomTom Go630 and it works fine in Romania and Bulgaria.

Yeah deff get a good one, I don't know how I would get around without my nav but mine came with my car