Awesome.
netstat -bn
Looks like AmazonAWS to me. No clue which ones are really the exact sever your playing on at any given time but my results here in the USA are really good by pining everything I see. <20ping sitting where I am now to just about all of them I tested. (look at PvZ.exe not Origin.exe)
If you're determined I'm sure by studying netstat -bn you can figure it exactly by rerunning time and again... switch server repeat. There is probably a script somewhere that could be tailored for this if you knew how / what to look for.
That's as much gas as I feel like throwing right now :P