As of today, RealClearPolitics.com is showing 210 House seats likely or leaning Republican, and 39 seats rated as tossups. Of those 39 seats, 37 are held by Democrats, 2 by Republicans. I expect that most of those tossup seats are going to go Republican--and I suspect some of the "lean Democrat" seats are actually going to go Republican as well, because of a shortage of recent polls in districts that are considered so traditionally Democrat that no one is taking the Republican challenger seriously. As an example, ID-1, held by Walt Minnick is considered "Likely Democrat"--but the race is, I think, a bit closer than that.
UPDATE: As of October 11, they are now showing 211 House seats likely or leaning Republican, and 39 states tossups.