The Embassy Suites in Battery Park City has some decent rates: New York Hotel Accommodations - NY - Embassy Suites Hotels New York
Nothing fancy, but it's not bad. It can be a pain in the ass to get around from BPC these days, though, due to the fact that the entire area is under construction (e.g., Goldman Sachs, WTC, new condos). But it's near Tribeca and you'd be near me!