I'd suggest first buying a good humidistat to see just how dry the room is, near the system. Then you can get a better handle on how big a problem you have and how effective the various fixes are. For instance, I gave away my Zerostat after discovering that it was really not doing the job, even as a band-aid.
The only really effective solution in my case was an 8 gallon humidifier from Sears whose filters cost $18 and don't last more than a couple months, so it's hardly a cheap fix. But it works, and nothing else did. Believe me, I tried everything mentioned above and even draped copper anti-static tinsel over the system. At least that had a festive look :-)