Since the flange is above the floor, a single regular wax should be fine.
If you need more water on the flush, just hold the handle down longer. Push and release is 1.28, holding down is about 2.5 gallons.
Elongated bowls are only code for ADA applications. As long as money is an issue, you will be seeing round bowls. Elongated bowls are still costing a bit more.
However, I wouldn't have a round bowl in my home, and many others don't like them either. Elongated is becoming more and more asked for.