It all depends on your budget, but seeing how you have the Logitech Z-5500's on there, you can probably afford them, so that gets my vote.
Also, about the cables, if you have the money get good cables to hook up to your Sound Card, they will make a huge difference. Example: It doesn't matter if you have 1,000 Horsepower if you can't turn
. Even if you do have a nice 750W 7.1 Surround Sound System and hook it up to onboard audio via $5 RadioShack cables it'll be wasted. Don't believe me? Get $50 cables from where ever, first hook up the speakers to your sound card with the cables the speakers can with or with cheap cables, then, after a few hours of use, hook up the $50 cables. And, please, tell me that there isn't a huge
ANYWAY, the Z-5500 has great high and low pitched sound and are amazingly well built. Plus, the remote and wireless "dock" is a great addition. Overall those speakers get a 5/5. There is nothing wrong with them in my mind, I could see that they could be out of people's budget and that they might take up too much space on a desk, but, honestly, you get what you pay for. And, if Logitech made them smaller, slimmer speakers they'd have the Z-5300.