Remodeling a bathroom

Hello. I am having great difficulty in chosing a new toilet. Our Kohler is 19 years old and has worked wonderfully.
I want a toilet that has a fast flush and doesn't gurgle its way down.
I am looking at the Toto Guinevere. Is it a fast flushing toilet?
I was also told to look for toilets with 3 - 3 1/2 flush valves.
Can you recommend some fast flushing toilets?
Thank You Very Much.
Heather

The Toto Guinevere works well. I've sold over 150 of the Soiree / Guinevere toilets so far, many of them repeat sales.
They have a 3" flush valve and 2-1/8" trapway.
You still hear the water leaving the bowl on a toilet unless you go with the old 9.5 gallon toilets that moved as slow as a glacier.