As far as Sven, I really like Soul Ring on him. Lets you spam the crap out of his stun. Crazy 325 damage in a large AOE is as useful for wiping out creep waves as it is for wiping out heroes.
Her aura is still really good, too. Once she hits level 7 and has maxed aura (assuming 1-1-4 build, which I think is standard now), that's about +20-24 damage to ranged allies just for being alive. That can't really be underestimated, especially if you have aggressive supports like WR or SD.