If you just want a lightbar, the Slite will work as well as anything.  If you want mapping (and I would certainly want mapping) then an STS is what you are looking for.  

If you are willing and able to figure things out, you can use the Slite and a laptop with a mapping program.  I used a laptop for years before mapping solutions were on the market.

Autosteer in everything is the answer.

Just depends on what you want to spend.