You could almost buy 6 Skip White "Ready to Run" distributors for that price, and there has been some issue's with Pertronics reliability of late.
Everyone I have seen mention the Skip White distributor was happy with it.
Just a FYI. :D
Both need an external coil so that part is a wash.
I had to turn my computer back on to amend this post.
If the Pertronics distributor has the Ignitor III in it that has rev limiting that would be a plus on it's side.