Putting in a new toilet in my master bath and I am amaized at how many choices are out there. I'm looking at going with an American standard Champion 4. Is that a good way to go? Is the 250$ worth it? I see that some toilets can get to be 1000 and up. I figured 150-200 would buy a decent toilet but the Champion 4 has a 4" flush valve and a 2 3/8 trap. How are those pressure assist ones are they worth the extra $???