Whitney,
We purchased a Miele canister vacuum as an alternative to a Nilfisk and have been very happy with it. Most have the variable control and HEPA capabilities. They may be a little out of your price range, but you might be able to find a sale or local dealer (prices online were in the $500-600 range).
Good luck in the age old search for an affordable, museum quality vacuum!
Melissa Jolley
Curator, Redcliffe Plantation State Historic Site
181 Redcliffe Road
Beech Island, SC 29842
803-827-1473
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