I have found a good seed for 1.7.2 where the map does not include too much water, but some parts of wider ocean and a good balance between different biomes. Please note that the current mapper does not necessarily color all the biomes 100% since it is not a properly 1.7.2 updated version, just one that happens to work with it.
Please do take a first look at the new map with the current lots overlaid. I would strongly advise against making too quick decisions now and wait for the upgraded 1.7.2 server to be live before you decide if you want to upgrade. I will most likely put the new empire world live (w/o mining rights) so you can take a look at your world then. Like that you will be able to make a decision if you want to move to a new lot or if you want to reset your current one.