I've been ripping the wires out of underwire bras for years. The style is fairly supportive even without the wires, and MUCH more comfortable.
As for the scars, you might consider a longline style. There is less pressure right below the breast, and you might actually find it supports the scarred area.
I've had good luck over the years with Warner styles. Also, I have a front closure longline from Exquisite Form called the Ful-ly bra #7530. Its very supportive of the upper back, and the torso in general.