The dealership would be able to get some of those options special ordered for you. Many times, certain packages / options are region based - but they can be acquired, shipped in to be port installed by the local dealership. If you try and special order a Corolla with the options you want - note that these \"custom\" options may take quite a bit of time - some cases, could be months before you will be able o pickup you \"car\".
The other option of adding in an aftermarket navi unit is possible - but I would highly suggest getting the base headunit, instead of popping extra money for the JBL unit. Like OEM installed BOSE, JBL, H/K units - they usually install inline filters/crossover networks that much be pulled out to be compatible with an aftermarket setup. Plus, you may not be compatible with many of the pre-installed amplifiers for the OEM premium audio systems. Use that extra money saved (may try and get a radio delete option, i.e. dealer will remove the radio and speakers, and give you some credit back - usually) and put it into another system of your choice.