Anderson Silva - Who's Left?

On Saturday night, Anderson Silva defeated Dan Henderson in the second round by submission. This victory solidified Silva as a legend in the MMA world. He got Henderson to submit at 4:52 in the second round by rear naked choke. 

I didn't personally get to watch the fight, but I've heard up to that point the fight was quite even.  

So my question is this: Who's left for Silva to fight? He has pretty much cleaned out the 185 pound division currently on contract in the UFC. Maybe he would consider going up to Light Heavyweight or down to Welterweight to see different opponents.  

After the fight with Henderson, Silva stated in an interview he wants his next fight to be against a 185 pound boxing champion. Boxers always say that MMA isn't technical at all, so Silva wants to prove to them how technical it can be.  

The current WBA Light Heavyweight champion is Danny Green. That weight class is at 175 pounds, so it could be a potential opponent for Silva. The cruiserweight division at 200 pounds has two champions: David Haye and Firat Arslan.  

I will admit I don't know much about the world of boxing, but those are the potential champions he could face.

If Silva cannot fight a boxer with the UFC rules, then maybe a third fight with Rich Franklin would happen. I don't really know who is most deserving of a title shot right now and it doesn't really matter who he fights because I don't see him losing for a while.  

Silva is going to have to consider changing weight classes if he wants to find better competition. I think Silva is a great fighter, maybe one of the best ever, but would like to see him have better fights in the future. I think a rematch with Henderson would be a great fight.  

What's next for Anderson Silva, unfortunately that will be decided by Dana White.