LOL, but the stronger front end isn't going to give you "good" HT sound, if you want to get them most noticeable change then get a good sub, cross your front where they can be crossed... Even if you get the biggest front end available, you are still going to cross them around 80hz, and there are plenty of bookshelfs that will reach lower than that...
I say get a new sub, a "good" sub, for that room you should look into the vtf2, lv12, or a minimum of the pb1000, but I would go for vtf2, buy once cry once..