Just upgraded recently from my 5 year-old Onkyo HT-510 speakers to the Athena's from audioadvisor. I ended up choosing the LS-500 package without the subwoofer. My current configuration is:
2x LS-500 Tower Speakers
1x LS-C100 Center
2x LS-100B Bookshelf Speakers
1X Onkyo Center Speaker (for rear center)
1X Onkyo Subwoofer
Onkyo HT-R510 6.1 receiver
Other Stuff:
Sony KDS-A552020
PS3 60GB
Xbox 360 Elite
Nintendo Wii
Custom HTPC
Dish Network (soon to be ComcastHD)
Samsung LN26A450 (for future bedroom)
My sources vary a lot; I run a pretty even mix between tv, movies, music, and gaming. So far I am very pleased with the Athenas. I'm no expert, but these are by far the best speakers I have ever owned. So I may be an audio-noob by the standards here, but I picked the Athenas based on info found on avsforum. I'm not someone with 5k+ to spend on home theater though either. They seem like a great choice for someone within my budget range.
Still using the old Onkyo HT-R510 receiver and the Onkyo sub though. I plan on upgrading the receiver to something with good HDMI pass-through(probably a newer onkyo), another set of LS-100's for 7.1 rears(hopefully before they are all gone), and a much better sub. For now it's great just to finally have some real speakers.
They are really putting my source material to the test, as now I actually notice imperfections that I never knew were there, along with some great instruments/sounds that I never noticed before either. Overall the range of frequency is so much improved from my previous setup, I can't help but be impressed by what I hear from the Athena LS series. So other than hearing some things
too good, most everything just sounds spectacular, not to mention the speakers look very nice with the rest of my setup.
Audioadvisor.com has made me one happy customer!

Here's a pic of everything in front without the covers on:
