I sell a lot of Gerber Avalanche series. They have a 3" flushvalve wich allows the water to flow faster from the tank to the bowl giving you a more powerful flush. Never had a callback or complaint. Besides the elongates bowl, you should look at the "comfort height" aka "handicap", the extra 2 1/2" doesn't sound like much but if you have bad knees or are getting up there in age, it's well worth the extra money. BTW if you do replace the toilet, you must always use a new wax ring and bolts and it's recomended you replace the supply tube as well.
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