I'd say go with one dagger & a bow, dual wielding daggers is fairly weak, so in times where you get up close, you'd just switch out the dagger for a sword, then go back to the dagger when the fights over.
Not too sure on destruction as an assassin as i've never actually played a mage based class.
Alternatively you could just go with a full bow build, when your sneak is high enough you're able to snipe someone, quickly hide, wait for the remaining enemies awareness to drop, then repeat, though this can get tedious fast.
TL;DR i say just go with a bow & one handed dagger & sword.