Kyle, if I understood your plan correctly, you cant decide between Scandinavia, and Central Europe (except for some of Poland). Well I personally cant see a European backpacking trip without including the Czech rep (Prague, but also some awesome small towns), South Poland (Krakow as well as some other places), Hungary and Austria.

An alternative to your route could be, after getting to Germany, go south through Austria, then east through the Czech rep. The country is pretty small, so you'll have no problem seeing everything. Then go north through Poland hitting Krakow, Warsaw and Gdansk (There isnt much to do in Poznan anyway). From Gdansk you can get a ferry to Sweden or Denmark and check out Scandinavia.

Some other notes: The Eurail pass does not function east of Germany, this might change in May (Poland, Czech rep entering EU) but I'm not sure. And because of the same reason, you might not need a visa to go to Czech rep, but once again, I'm not sure.

I did a condensed version of your trip over 3 months this summer. But I stayed in the region of central Europe. Basically the eastern half of Germany, Poland, Czech rep, Slovakia. I skipped Hungary and Austria as I ran out of time.