It seems ideal for a young family.It would be extremely convenient. I like the way you can come down the hill on various surface streets and hit very good points from which to access, or head off, to most other parts of the city and neighboring cities too.
Some of the properties catch a lot of freeway noise and/or surface street traffic. If it were me I would focus on properties not on double yellow lined streets and in from the periphery to avoid freeway noise and on properties that have in some way mitigated these negatives. Other than that there are a lot of options to work with,such as, lot size and situation , house size, views ect. I would be careful about the lots most prone to erosion.
There are also nice homes and lots inthe area East of Avocado on and around Fuerte, which while in El Cajon are very much are like some of the nice parts of Mt Helix. So the zip code is 92020. This is around Thomas Bros. Map page 1271 H2 and surrounding sections.