I am looking to get a matched set of 4 811A's for my 30L-1. I see three vendors with varying prices and would like folks opinion on whose I should get. There is the folks once known as Alpha, best price ($71 for 4), but not in stock. Then there are the Machletts on e-Pay. Last are the RF Parts ones (who are the highest price). Opinions anyone ?? Tnx, Dick, W1KSZ