I see this often. since you have a decent sub, and you will be crossing your fronts to your sub below say 80hz, why not just get a really nice set of bookshelfs, you get more sound quality for your money, and IMO they normally sound better than towers, less cabinet resonance, nicer mids, ect.. More of your budget can go to the speakers vs cabinet materials and extra shipping costs....
for $400 you can get a set of Carnegie CSB1's and will be amazed at the sq and sound stage them things throw off, GR is selling them for $400 a pair for a limited time {I believe he has some left, a few of us on here bought sets and so far everyone has been happy... use the search there are some topics with pics and reviews... I like them a lot for muisc, I have a pair of 2200 mono blocks behind them and paired with an svs sb12 dual drive, they sound really nice, and they sound better than any $1000 towers I can think of..