Okay... I'm giving in. I've decided to "update" my period of coverage to a point allowing early diesels... Wondering if there are suggestions as to a brand. I know Proto 2000 seems to come highly recommended. I'm not looking for brass, but aside from that prefer higher-end, higher-quality stuff. I model the PRR, so would prefer the option to buy lettered for PRR, but unlettered will do in a pinch.