Ignition Upgrade

Thinking about upgrading my ignition system ( distributor ) it is the electronic distributor now but not sure how old it is. I really don't plan on taking the car to the strip so I can't see spending big bucks on a MSD. Would like something to just plug in and go. Do I stay with the Mopar Performance Distributor or something else. Are the HEI distributors better than the stock replacement's ?
Talk to Don at FBO (member cuda66273), he just built up a distributor for my 340 and it worked great out of the box.
Anyone in the market for a slightly used MSD Pro billet?