2.5+ firmware have highlighting, I think. Only the browser is the old one.
Yes, DXG is a real Pearl displays. Not VizPlex as in Kindles 1 and 2 (but there are some speculations that Kindle 2 International uses improved VizPlex although it is not a Pearl).
For a Pearl in the DX i found here
http://news.softpedia.com/news/Amazo...y-146026.shtml - I cannot prove this because I have Kindle 2 International 3G.
If you can afford the price - get DXG, I was somewhat limited with resources (there is still a crisis in Bulgaria) so that is why I got a used Kindle 2 on eBay. My dreams is DXG. I am going to save up for a DX(G) - maybe for the Easter of 2011.