What 'all in one' lens to get for Sony Alpha
I have an Alpha A33 that I am not using as much as I expected. I do take it with me on trips and other places but it's not developing in the hobby I thought it would be. Currently I have 5 lens, the kit 18-55, a Minolta 50MM 1.7, a Minolta 24-85 that I got since it has the macro option (I think that's the lens, may have my numbers switched) and 2 cheapy lens I never use.
I don't do portrait much and typically shoot nature either from up close or far away so I'd like something that can do a reasonnable macro type shot and zoom around 11-14x.
My plan is to get an 18-250 lens and sell the others... but is that my best option? I have 600$ to spend including taxes and shipping so in that range, is the Sony 18-250 my best choice or would the Tamron or Sigma be a better choice- or is there a completely different lens I should consider? Some may say I'd be better off buying an 18-70 or 18-135 and adding a 70-300- would that be a better option? One thing I would consider, if its in my price range, is buying a separate lens for macro and telephoto- but not having to swap is my preference.
So... advice? And thanks in advance!