canuck, you have a very tall order there. Even though paying cash, the fact that you don’t want to “fix anything” is an issue. You must know that the SR-125 is a toll road from SR-54 to Eastlake and all the way to the int’l border. That back and forth commute to Otay Lakes Road from points north would cost you up to $8 daily in tolls. And you must also be aware that 91913 and 91914 (Eastlake/RHR) and 91915 (Otay Ranch) have predominately HOA tracts and Mello Roos. Those SFR’s without Mello Roos in those zip codes would NOT be in your price range, unless possibly structurally damaged. Therefore, I believe it would be best for you (and more convenient) to purchase an SFR in 91910, 91911, 92139 or 92154. In 91910, your request is still a tall order. In the others, it could be “doable” but may not be what you are looking for.
What one buyer believes is a “fixer” may not necessarily be what another buyer believes is a “fixer.” This issue is entirely subjective.
Why don’t you just rent in or near Eastlake for awhile to get a feel for where you want to buy property? 91913 is the least expensive zip to rent in out there. The areas you have mentioned in your OP are highly diverse from one another and also not very close to Eastlake as well as freeway dependent.