Anyone Have MSD Coil on Plugs

So I just recently installed a Vortech kit on my 04GT and everything is great. I am making 395rwhp and 394trq but my car has 84k on it. Do you think its time for a new set of coil on plug wires? I was looking at the set from MSD but they look a little pricey. Do you think it is worth it? I have already put enough money into the car and definitely don't want to start skimping on stuff now but wanted everyones opinion. In case you aren't familiar with the product this is what I am talking about...
MSD Blaster Coil On Plug Set (99-04 GT) at AmericanMuscle.com - Free Shipping!
 
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Ya only reason I have msd's on mine is because I lost a cop when it blew a plug out and 1 was $50 so I bought the msd's for $370. It idles a little smoother and may be a bit more peppy. But I don't know what gains were made since there is no Dyno before n after.