Originally posted by Kozlok If you need a second lens now, get the DAL 50-200. It is smaller, cheaper and better than the super zooms.
Smaller and cheaper, yes, but are you sure about better? I would think that any of the better superzooms (Tamron/Pentax 18-250, Pentax 18-270 or Sigma 18-250) would produce images at least as good, if not better than the 50-200.
But, like everyone else, I think the 55-300 would be a better fit with the 28-80 as a longer telephoto option. It is significantly faster and better at the long end than my Tamron 18-250. The DA-L version can be had second hand for less than $200. (That might leave room in the budget for something wider too, like the Pentax DA 16-45 or, better still, a good ultrawide zoom.)
70-200 lenses are a different beast altogether. Much faster, probably much better IQ, but more expensive and a lot lot heavier. Unless you are used to a 1.2kg lens, the weight will come as a shock. If, as you say, you don't really need the speed anyway, forget it.