I want to go a step further.
My receiver can do 6.1 setup with 2 Array speakers, and I'm considering it over the 2 SuperSats3s. for the rears.
Is there a good wireless kits that can do a 3.0 or 3.1 rear Array setup?

All the wireless kits I know of are stereo, so you'll need two - but your description doesn't sound like wireless is an option (do you have separate amps for the three rear channels and does your receiver have pre-outs for the three rear channels?).

Just one receiver ( H/K AVR 3600) . It says you can run 5.1 at setup and add 1 by connecting back surround LEFT to form 6.1.

Yep, that will work fine, but that's not going to allow you to have the rear speakers be wireless. The wires from your receiver's speaker terminals will have to be run to the three rear channels.

Ok thanks. I still haven't decided which way to go. What are some good 2 channel wireless kits that you would recommend?

Sorry - have no experience with wireless systems including amps ... the ones I've seen are very low-end solutions, like the Rocketfish Universal Wireless Rear Speaker Kit (about 100 dollars for two speakers, rated at 25 watts/channel). CNET review of it was 3 stars.