Get the 3k and 5k, and if you would like to later, get the 10k.
If you choose to go with Chosera, the 2K or 3K Chosera will set up the edge for the 5K and 10K Choseras. Since the 3K is not a polishing stone, going from the 1K stock EP to the Chosera 3K is reasonable. Skipping from 2K to 5K and 3K to 10K is also acceptable, although still using the 5K before the 10K is probably best in the long run. Because of the close proximity of the 2K and 3K, the best option for you will depend on which stone is used before and after.