Yes, I agree with you. I don't really collect decimals myself (apart from a representative collection of proof sets and BU sets), but there's no arguing that that 1983 2p is THE major modern rarity, unless the aquatics 50p rivals it for numbers. So you won't find snobbery here about it. Having said that, if you asked me if I'd rather have the 1983 2p or a really high grade William III halfcrown, I'd go with the halfcrown every time  No contest for me neither, just a no-brainer!