Hi, E.:
I can definitely give you information about 1604/Fiesta Texas area because that's exactly where I lived. It's a very quickly developing area, so traffic is really bad on 1604, in-bound during the morning commute, out-bound during the evening commute. It's only a two-lane highway in both directions. With that said, Houston's traffic is probably worse (I grew up in Spring/north Houston and returned to Houston for seven years after graduating college).
Helotes is a neat area, definitely rural, but not too far from the city. I can't tell you much about Helotes School District, but I think they only have a couple of elementaries and one middle school. As far as I know, all of the teens in Helotes go to Sandra Day O'Connor H.S., which is a Northside ISD school. O'Connor is a great high school - I was an English teacher there for six years! I wish I could give you more information on preschools, but I just don't know - my daughter just turned three, so now that is what I'm looking for up here in Vancouver. The best school districts in San Antonio are Northside, North East and Alamo Heights, Northside and North East service a huge area, so keep that in mind.
My daughter attended AppleTree Day School on 1604 at Old Prue Road, which is pretty close to Helotes. The phone number is ###-###-#### - talk with Alan, Jennifer or Lloyd. My daughter really thrived there and it's really reasonably priced. You'll be pleased with the savings of daycares in San Antonio as opposed to here, and, I suspect AppleTree has a preschool program.
Hope this information helps!
C. S.