What lens for A57?

I just picked up the a57 + 18-135 combo from Amazon ($900). I'm pretty pleased with both so far. Yes, the lens does hunt a bit in low light at the long end. But no worse than any other 'consumer' zoom lens I've used (just now switching from Nikon). I think the range is really nice and so far the IQ is what I would expect. I will say I can see myself picking up an external flash pretty soon. I find myself using flash a lot for kids activities such as birthday parties, etc.