Favorite rentals: I mostly use Classic Party Rentals.
Favorite tents: I don't want the tent vendors I work with to shoot me for saying this, but the truth is tents, left to their own devices, are not all that good looking. My pet peeve is leaving those aluminum tent poles exposed. At least get the rental company to cover them with white nylon if you can't afford fabric. The thing I like about Sperry Tents is that they look pretty groovy on their own. I'm pretty sure they're the only company in the country that makes their tents out of vintage sail cloth.