Plumbing - Toilet Floor Mount Tank
Best to use a floor mount toilet with an all in one one piece tank.
American Standard Fairfield White Elongated Standard Height 1-Piece Toilet
https://www.lowesforpros.com/products/view.aspx?family=2310717 $213.20 - 5% + tax. Free shipping to home.
KOHLER Santa Rosa Comfort Height 1-piece 1.28 GPF Compact Single Flush Elongated Toilet in White
Here's a really low cost two piece elongated that seems good...
AquaSource Henshaw White WaterSense Labeled Elongated Chair Height 2-piece Toilet 12-in Rough-In Size https://www.lowesforpros.com/pd/AquaSource-Henshaw-White-WaterSense-Labeled-Elongated-Chair-Height-2-piece-Toilet-12-in-Rough-In-Size/1000340935 $99 - 5% + tax
Here's one that is good but not a one piece...
TOTO Drake Cotton White 1.6-GPF (6.06-LPF) 12 Rough-In Elongated 2-Piece Standard Height Toilet.
Toto Drake CST744S
Optionally fit a bidet seat eg
https://flash.newegg.com/Product/9SIA5A04RH6086 $259 (when on sale)