I prefer the Ridgid brand (not Shop Vac). They are available at Home Depot. I have one that is 5 hp. I like the larger hoses (I think they're maybe 2.5" in diameter?) so it is less likely to clog with hay and shavings (but still does) and I purchased the expensive fine dust filtering filter and switched out the included one. I like that that filter is washable and does a much better job of filtering out dust and fur than the original filter.