I would also add White Plains to the mix of lower tax towns (not all houses there, but it is not bad tax-wise compared to others). Be aware that in Westchester, house tax bills can vary widely within the same township, so don't exclude a town because you think the taxes will be too high. Have that be a criteria you have your buyer's agent use when they are looking for properties for you.
Let me know if I can be of further help,
WEICHERT, REALTORS - House & Home
(718) 432-5000 ext.601 (Office)
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If you are looking for a single family home, with property taxes under $10,000, then consider towns like Peekskill, Yorktown Heights, North Salem, Mount Kisco, South Salem, Yonkers, Mount Vernon, New Rochelle. If you prefer condos, then you might also consider Peekskill, Yorktown Heights, Somers, Port Chester. If you are looking to buy a multi-family then consider Yonkers.
Keller Williams Realty Group