I have only owned the 55-250 EFS for a month or so, and am not unhappy with it, but it seems I have the opportunity to upgrade. The wife's 70-300 EF lens has pretty much croaked (ribbon cable issue), so I generously offered her my 55-250, and I upgrade. Budget is tight, and I am liking what I read about Tamron's SP70-300mm F/4-5.6 Di VC USD. Would this be a decent upgrade? I better strike whilst the iron is hot, because I dont often get permission for new toys Also is there anything else I should consider similarly priced?