Let me clarify; what lens would you love to own - ideally for the current eqpt. you have - would you love to own? Doesn't matter what brand, as long as it fits/works with an SLR body you own. Mine would be a 300mm f/2.8; the first time I saw one existed I always wanted to own one. As a Canon AF SLR user, a more unrealistic option would be the Canon 400mm f/2.8... but we can all have those kinda dreams.