I have no idea what the realistic price would be for you in the USA.
However, be sure that you are comparing apples to apples!!!
What are the inclusions of each of these prices quoted?
Some may be including all the feet/accessories. Some not.
Some further service and extended warranty beyond the basic Janome offering.
Some a table. Some not.
Some classes/instruction, etc. etc. etc.
Knowing the price tells you NOTHING, til you know what it represents.
Also, will they take your old machine as a trade in? And at what value?
Good Luck!!!!!!!