Looking to take my son to Germany next summer. Seems like getting to Asia is easy to figure out, but Europe requires a little more work?

Can you help me with which points might be the best to use and best way to search for award availability. Any stop over open jaw ideas would be very helpful.

1. I live in LAS
2. I don't care where we end up in Germany as long as we can get there.
3. prefer first class, but business is ok if it's a 180 degree bed.
4. Need 2 seats
5. Travel between May to Sept.

Here are my points

DL 400K
UL 135K
BA 800K
American Express 600K
Singapore 90K
Chase 50K
AA 300K
US 280K
Hawaiian 90K
Alaska 140K

I was thinking use the US miles as I have a good stash of BA and AA already? I know of Air Berlin which comes to Vegas, but confused on the seats, travel days, etc. How do I search for flights?

Any help at all would be great. Any tricks?