if you ride dunes and trails and not too much mx then go with the rap...if all you were riding was dunes then i'd say go banshee but since you will be riding trails id go rap

 

If you want to have the better trail quad, get the 700. If you want the better dune quad get the shee. If you want the all out performance race quad, get the yfz. I ride a yfz, where as my girl rides a raptor 700. I prefer the 700 for trail riding and long distances, or anything that requires going slower paced. For screaming and all out performance I love the yfz, but if you go slow, or long distance riding, then it can get harsh. I had the banshee, and it was a straight out blast for the dunes, but didnt like it for trails as you dont have linear power, only one big hit.
There all fine machines, just depends on what your doing. Good luck!!

 

As ATVrider89 said, There maybe are a few bugs with the '06 700R EFI and I'm sure they're are. But the 700R is honestly a great bike all around. If I were you and wouldn't have a problem with waiting awhile until the '07 edition come out of the 700R because I'm sure they will do a few modifications with the EFI system if not a few more things.

Overall: I would say wait and see about the '07 Raptor 700R, It will most likely be your best choice, Unless you cannot wait, Then go with a '05 660 Raptor

Good Luck, Matt