The quality of my toilet

I live in a very large, extremely old home, and there are frequent problems with plumbing.  There are two bathrooms in the house, and for the first few years after moving in, we all knew that the downstairs toilet was not trustworthy.  We figured there was something wrong with the drain, because the downstairs toilet was constantly clogged.  We kept a plunger right beside the toilet because we needed to plunge daily.  My husband got very proficient at replacing the guts in the tank of the toilet.  He tried absolutely everything to get that toilet to flush properly and reliably.  When my husband finally got tired of dealing with the clogged toilet and non stop repairs, he replaced it.  He did some research and chose a new toilet with high ratings for water pressure and flushing capacity.  I had not realized there was a big difference in the quality of toilets, but there definitely is.  The new toilet is actually much more comfortable to sit on, resists stains, and has a tremendous amount of flushing power.  It never clogs anymore, and now the downstairs toilet is the one we all like best.  I am trying to convince my husband to also replace the upstairs toilet.  Although the upstairs toilet only needs to be plunged every week, the bowl is stained with rust and sometimes it won’t shut off.  We need to jiggle the handle or the toilet might run us out of water.  Now that I know there is a range in toilet quality, I am willing to spend any amount of money to have good working and dependable toilet.