The Eljer Titan should be fine for the job.
When I compare side to side out of the box, it looks like a lessor quality grade compared to something like a Toto Drake, but good enough.
The Eljer uses a Fluidmaster fill valve.
The Toto uses a Korky Quietfill.
Both of those fill valves are sold at Lowes, as is the Toto flapper.
I don't know who sells an Eljer flapper.
In the Seattle area, I pay more for the Titan than I do for the Drake.
I wouldn' t set the Eljer with wax. I would use something like a Fluidmaster waxless seal.