I purchase universal wire sets and cut them to fit (get a decent crimper too). You can dress them the way you want and come up with a neater installation. Also, if you have headers typically the #3 tube will run over the #5 and #7 tubes. Routing the wires between the tube and the head even with the fiberglass insulator will cook them in a short period of time. Either get multi-angle boots (ones you can bend to an andle) or the 120 degree boots so you can route #5 and #7 under the header tube (use fiberglass insulating sleeves too in these positions), the 120 degree works well for the other positions too.
Don't get too hung up on diamater or resistance. Any good quality wire from Accel, MSD, Taylor, etc with a spiral wrapped core will give you good service. I have Moroso Blue Max wires right now on the cuda, Accel on my truck and my wife has MSD on her PT and they all work very well. Summit or Jegs will give you plenty of choices.