Why not just buy a new tank? If you like your bowl, you can keep your bowl...
This.
Didn't know that was an option. Mrs. Miguel has had a running concern on the toilet's capacity, as Miguel Jr. and Mini Miguel are, well, increasing their capacities.
Ended up getting a Kohler from Home Depot: KOHLER Highline Classic the Complete Solution 2-piece 1.28 GPF Single Flush Elongated Toilet in White-K-11499-0 - The Home Depot
We did look at the golf ball video for American Standard, but ended up going with the Kohler since it was on sale. "It's just a toilet" she said. That's my girl.