I don't think you will find one that seals up real well. I had the retractible kind that sort of rolls up, it leaked both dust and water. I also had a hard top, it kept everything dry, but leaked dust. I haven't tried a soft top, but I wouldn't expect it to be any better at keeping out dust. The only way to keep dust out might be to hook up a fan and a filter and try to presurize the box.
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