The Jamos might not really fit with what you're looking for as they're discontinued and might only be available on the used market, so not returnable. You might however find an incredible deal on these things and they are a kind of larger bookshelf speaker (they have really satisfying, punchy bass with their 6.5" woofer), though as I said, in order to sound really large you might need to pair them with more wattage. I haven't head them, but I hear a lot of good things about the Klipsch RM600 speakers, which are larger bookshelfs and are very efficient so probably can pack a lot of punch with the amplification that you have...