Puritan Audio PSM-156 might be worth a look. They come up used, so I waited for one near me and got it less than half of new price ($3,500 USD) with their "Ultimate PC" included. I think it checks all you boxes with 6 outputs that are spaced enough for big plugs. Well within budget (used) and should be a good step up from current. If you care about Reviews, Steve Huff dubbed the PSM-156 the best power conditioner ever regardless of price FWIW.

