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I face the same situation: An older home that has intermittent (and hard for me to pinpoint) grounding problems. I just bought an ART "Clean Box II" that has made a HUGE difference on a couple of occasions. I've only had it for a week, so my experience with it is limited, but so far it seems like a great deal for under 50 bucks.
For noise reduction plug-ins, I got a nice deal last year on the Sony Oxford Restoration Bundle. The de-noise plug-in can really clean up tons of hiss from noisy tracks--- and I can't hear ANY perceptible artifacts on guitars or vocals. It's amazing on most things, the exception being bass tracks. I can't even lightly touch those without artifacts. I've never used any other noise reduction plugs, so I don't have any frame of reference, but I'd buy the Sony stuff again in a heartbeat.
Try a box like the one I mentioned. It might solve your issues for a fraction of the cost of plug-ins.
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