Sounds like you know exactly what you are looking for and have a grip on your wants vs. needs. I'm a real estate agent based in in Northwest Yonkers, and I list and sell in all of the surrounding areas, all of which are quick commutes to Manhattan. I don't know if you are familiar with theses areas, but NW Yonkers, Hastings, Dobbs Ferry, Irvington, and Tarrytown are all located on/near the Hudson River providing some of the most spectacular views in Westchester. I think you will find Yonkers has the lowest property taxes and housing prices are generally a bit lower in Yonkers also, which may appeal to you and it is the faster commute of the towns I've mentioned. You might even be able to find a property that meets your needs that is within walking distance of the train.
If you would like, I can add to my email list and email listings of houses in those towns. Please feel free to contact me by phone or email. I look forward to hearing from you.
Licensed Real Estate Salesperson NYS
Margot Bennett, Inc.