If you haven't tried it yet, you can check your ping to Dallas and Frankfurt using this tool: Ping Tool This should give you an idea of which classes will be playable with your ping.
I can live with this. NA 151 EU 38 That's the same ping I had to Tera NA without WTFast, and with WTFast it dropped to 120. Not sure if it'll work with the EU servers right at launch, but probably shortly after, so should end up at ~30 to EU.
i have 11 ping for EU. you can check with wtfast what your ping is. i'l make a guide for this soon as well