When I needed a new toilet a while back I looked at a dual-flush model, Kohler IIRC. When I contacted a plumbing service about installing, they said they have the least problems with the Am. Std. Champion 4. Got the oval model for $230 at Home Depot and so far it's great - it's the 1.25 ga model that's supposed to be able to flush a bucket of golf balls, but I only have about half a bucket so far so I won't be able to try that for a while...
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