German is a great area to get into. There's a lot to offer and something for almost anyone. Empire gets a lot of love from people, but I prefer coins from the time of the East/West split. That said, though, I'll go for anything German that catches my eye aside from Nazi stuff. I don't like Nazi stuff. But, other than that, I'm pretty fair game with German. If you like a good bird depiction, German coins have A TON of them!! I really like the latest bird depiction Germany has done, too, on the 1 and 2 Euro coins:
I don't have one yet, but I'm planning on picking up a Hamburg or Berlin proof set to add the designs to my collection. Germany is really good at awesome bird depictions.