Subwoofer with 2 channel stereo setup

Depends on the system and the sub. I never heard of anyone having a really easy time trying to integrate a subwoofer with the existing system. Just always seems to be very challenging.

The best advice, I think, is to demo it, if you can, in your room with your system.

I agree with S7horton. That is, it will depend on the system, speaker / room interface and the type of music that you listen to. I would not consider it necessary unless you listened to a lot of bass heavy music at higher than average levels and / or your system / speakers were either lean sounding and / or not capable of extended bass at higher outputs. I wouldn't go this route unless you were completely satisfied with the idea that you were already obtaining optimum performance from what you've got. Adding more to a system simply makes it more complex and harder to set-up. I'm a firm believer in the "KISS" theory for the average enthusiast that isnt' technically inclined. For those that don't know what KISS means, it is an abbreviation for "Keep It Simple, Stupid" : ) Sean
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For sure it makes a difference in certain systems! Integrating a subwoofer into a system isn't easy but it ain't all that hard either. I for one couldn't live without it. I like it so much, I've seriously considered buying a second one to run in stereo. Only question I have is..what brought you to the conclusion you have to spend $2000 to get a decent musical sub? The KISS theory works well too! :-)