Yeah....I hear where you're coming from. Comp speakers don't come close to realistic representation of the actual sound. I do a good bit of editing work and sometimes what I have to do in that situation is make an edit test disk. Record the same cut several times with different eq level adjustments and name each cut according to the adjustment made. Burn all the cuts as seperate tracks onto a disc and playback on home stereo. It's a bit much, but it really doesn't take that long at all with Wavelab. I guess, depending on the importance of the show you're editing, it can definitely be worth it. All that being said, you probably had allready considered that option anyway. Just thought there was a chance this could help you out.
If you keep using Wavelab 5 on the same computer with the same playback system you eventually start to get an idea of what your adjustments will sound like when played back on another output device. That's what's happened to me. Unless I'm working on something very important or editing for someone else...I don't even bother with the process I listed above.
If I can help in any way, let me know.