Towers do tend to offer more dynamic range, but if you aren't in a big room, with seating more than 8 or 9' away, good Stand Mounts should work pretty well when paired with quality Sub-Woofage.
Of course, I'm always a fan of a good 3-way design.
In terms of placement and room acoustics, I REALLY like Maz's rec for the Prime Pinnacles. They seem to review very well, and the Ultra Towers have a reputation for being a little difficult to place in-room.