When I last did a bathroom over, I discovered that the toilet manufacturer (Kohler) at that time offered an option called -EB, for "elongated bowl" on many models. The -EB option gave a bowl which was much larger front-to-back, and gave a lot more room. This didn't affect the water level any, but did give more room to arrange things, as well as better access to cleanse yourself after the act. That particular toilet was also quite tall, and had no problems with the water level. However, different styles of toilet give varying distance above the water. In the house I have now, I often get baptized in the toilet in the master bath (which was picked out by a woman), but not in the guest bath, which is a taller toilet, with more clearance above the water.
When in the shrowroom or store buying a toilet, you can often get a good idea of how high the water level will be by looking at the side of the back part of the base. In some toilets, you can see an outline of the serpentine trap passage that the water flows through to the drain. If the toilet is working correctly, the bowl will refill to the level of the lower side of the upper bend of this passage. Certain low-flow units may work differently, however.
When in the shrowroom or store buying a toilet, you can often get a good idea of how high the water level will be by looking at the side of the back part of the base. In some toilets, you can see an outline of the serpentine trap passage that the water flows through to the drain. If the toilet is working correctly, the bowl will refill to the level of the lower side of the upper bend of this passage. Certain low-flow units may work differently, however.