Hi dan,
Wow - so sorry this post was missed!
Based on your bookshelf placement requirements, if the Sierra-1 are in your budget -- these would be the right speakers to go with. We now have an add-on for the Sierra-1 called Q-Plugs, which are specifically designed to maximum performance with this type of placement (Q-Plug A would be recommended).
Click here for more details: http://forum.ascendacoustics.com/showthread.php?t=3781
Hope this helps and please let me know if I can be of any additional assistance.