Hello Aztobv ~
Congrats on your move to Bellevue. We're not objective here, but think it's the greatest place to live in the States!
Unfortunately, I don't see a lot of great rent-to-own properties in our area. Most Sellers are needing the equity out of their home, or the monthly payment off their credit report in order to be able to move on with their new plans. In addition, the ones that are listed as rent-to-own are generally not the best homes on the rental or sale market.
So, in my humble opinion, I would recommend finding the best home for lease that works for you and your family. It is always possible when you find a great home that the owner may be willing to sell to you in the future, or consider working out a lease-to-own agreement with you. Issaquah schools are great. Some other great school districts are Bellevue, Northshore, and Lake Washington. I love the GreatSchools.com website for comparing schools and districts as well.
Many renters are looking at CraigsList.com here, and you'll probably find the best representation of available homes there. Still, be very careful of scams ~ homes have been rented off Craigslist when the "owner" turned out not to be the legitimate owner of the property, so do some good research before you write a check.
Best of luck to you. I do not work with lease agreements, but will forward your question to a good property manager I know that helps some of my clients. Please feel free to contact me if you need a local friend in the real estate business.
Better Homes and Gardens Real Estate Executive
40 Lake Bellevue, Ste 100
Bellevue, WA 98007