If you want the best audio performance, look into going with an AT (acoustically transparent) screen. The Seymour stuff is very popular for those looking to save some money, fixing it themselves, while having a weave for very good overall performance.
You will want either towers, or bookshelves. Depending on the bookshelves, and how nuts you get, you can couple each of the three front bookshelves to their own subwoofer.
Aperion is more of an "audiophile" company. Note that some models have low sensitivity, which is not an ideal as far as loud HT goes.
Some of the hot items right now for HT-use include JTR and Seaton. However, you surely can't afford a whole set all at once from them, but can piece it over time.