American Standard gets pretty decent reviews. I have multiple rental units so I've bought several toilets over the years. The worst case is when they start to run and the tenants don't tell you until the water bill comes in. Then a new toilet is way cheaper than the water bill. Cadet 3 or 4 or even Champion should be fine. Only problem I've had with Kohler is that they use a different flush valve, some type of canister valve so you can't just throw in a Fluid Master kit when it starts to leak or run. If you want to go nuts, you can get a Toto Drake which is one of the best toilets out there, but they're a little over $200 mail order so it's only good if it's for your own home, I wouldn't put it in a rental. Also I'd stay away from Glacier Bay anything, that's Home Depot's in house brand. It's only good if you're planning on selling the place in a couple of years, a friend put in 3 of them, one of them leaked/ran right out of the box. The quality just isn't there for the price you pay. When it comes to any fixture that involves water, you should always go with a brand name, most of them have a lifetime warranty.