I've owned and listened to the Boston 4.1 (sitting in my closet) and the Promedia 5.1's. I prefer the
Promedia's over the Boston's. Richer, fuller sound and the bass for my ears is much better. However, the
cost is substantially higher on the Klipsch product and does not meet your budget constraints.
I have not listened to the Klipsch 4.1 system.
Many of the people here are raving about the Logitech's cost verus performance. Both Klipsch and
Logitech are available at Best Buy. Not sure about the Boston's product availability there as they came
with my Gateway PC. However I am sure they are available online.
My suggestion would be due to Best Buy's lucrative return policy, try Klipsch, Logitech and whatever you
want. Put them on a credit card, set them up IN YOUR HOME and do a comparison of your final two choices. Listen for a week or two and then return the system that you don't want and get the credit back before the billing cycle is completed.
Personally, unless I am able to hear speakers in my home in a side by side testing environment, a decision is difficult. This is contingent upon not being blown away by the differences between my choices
in the store. However, I am not convinced that Best Buy is the place to truly reach such a decision.
Always trust YOUR ears. No one else's.
Good luck. Hope this helps.
Cheers..............