Sorry if this should be Tools, but it seemed it might be better here. First, I don't know a lot about this. I want a mixer big enough for 1 bag of cement (1 cf, 90lbs?) with the right sand, aggregate and water for the mix. Is 3.5 cf big enough for this? I'm looking for used electric mixer. Any ideas what to look for? It's probably best to stay from Harbor Freight types so I have something that will last. Any others I should watch out for? Thanks! Riley...who just got a call from someone to go look at a mixer. sigh.