First lines are definitely tricky. So are first pages, first chapters, first WIPs... And I'm sure you've spent as much time obsessing over these things as I have.
There was a little kismet in first line advice over the last few days - really helpful info from three great sources:
--Kidlit.com's First Line Contest (with analysis on the winners)
--Jennifer Hubbard's Favorite First Lines:
--How to Write a Killer First Sentence (WriteOnCon Tips from Jodi Meadows)
If you're interested in digging up more great openers, head to Amazon and utilize the "Look Inside" feature. You can read the first several pages - but most importantly, the first line and the first page.