I'd go with 2 AquaClears, 2 50's (or a 30 and a 50) it should be enough unless you have fish the produce a lot of waste. If it's a planted tank without a large bioload you can use less filtration than a fish only tank. I bought a used AC
110 in great shape from someone on the local fish forum at a really good price.
I've used an Emperor 280 on another tank. It's a workhorse, 9 years with no problems. I don't use the Emperor filters, way to expensive. The largest Whisper filters work with a slight trim of the frame. HBH filter fiber pads also work great over the Whisper frame and save even more money. If you need carbon and/or ammochips you can put them in the media basket.
I like the flow across the surface better on the AC
, less turbulence and less noise if the water level is a little low. When the Emperor is on the feeding setting (low) it gets loud except right after it's been cleaned. AC
's is quiet on all flow levels.