You haven't read the books
Well,you now that could be a good thing at the same time,cause when you take books in your hands you never,ever let them go!So you could wait until all the books are published and than read them.
P.S.Yeah,you shouldn't make rush decisions cause maybe you will like to be in another house later,and anyway ppl are great in all of the houses,it doesn't matter what kind of ppl are in books in which houses,here it's more like with who do you hang out the most...