I found this site has comparision between Nuvi 350 vs Nuvi 200. (both about same price off ebay)
You will notice Nuvi 200 has much better screen and resolution.
http://www.brothersontech.com/blog/nathan/garmin-interface-comparison
I took those pictures myself and fear that they might be slightly misleading. Both screens have the same resolution although I do believe the 200 might be brighter and have better viewing angles. Not completely sure on that. The 350 screen appears a bit washed out in the pics but that could just be the fault of my photography. I do think Garmin has improved the graphics in the 200 which gives the appearance of better resolution and screen quality. It's just more polished looking.
Despite all the comparisons, I still ended up with TomTom.