I'd say stick with the "stability and security" comments, and try to phrase it in a way that you're looking to better yourself.
In the past I've told potential employers that my company has gone through a series of layoffs and the end does not seem in sight; that I need financial stability and job security.
Good luck, and keep your spirits up - you've done a great job managing to someone else's poor management skills.

winkiebear
Deskdemon Editorial Board Member