Good set-up ... for starting out
Several folks have been through here, asking pretty much the same thing, recently ... and opinions abound. I can only speak from my own experiences, having shot a lot of the glass that most people have in their respective bags (check out 'my gear list', in my signature, below. You should be able to find most of what is currently available, listed there. If not, it is either a lot more expensive or simply duplicates what I already have and there is not enough benefit to purchase it. Do not be afraid to ask, though. We discuss it all, here).
As a convenience lens ... I usually recommend going with the TAMRON or SONY 18-250 f/3.5-6.3 (<-click on the link) (not the 18-200) and buying an external flash, to handle the longer shots, too.
You need a little more light with this particular lens, but you trade that for the convenience of using one lens that can provide a pretty decent shot. If you read thriough the thread posts of the past few months, in the SONY DSLR Forum, you can easily locate some reviews that have done "quick-shot" comparisons (<- click on link) between them. Nothing too seriously extensive, but enough to show the average result between the lenses.
Also, there are a series of lens surveys that show what is available for the SONY mount ... so you can get a list together and compare them, yourself, at the local camera store.