just like in any other places, neighborhoods will vary within the city. There are various sections in Temecula, such as Vail Ranch, Paseo Del Sol, Redhawk, Wolf Valley/Creek, Rancho etc. As a resident and Realtor in Southwest Riverside I have the opportunity to work with clients who are investing in this area. Also, different neighborhoods and areas in Temecula will command different rental/lease rates.
By far, enlisting a Realtor to assist you in this process would likely prove worth it, especially since there is no cost to you to utilize a Buyer's Agent/Representative. The are a lot of properties available in the Temecula area and just like those who are buying to occupy a property the key is finding an undervalued property in an area. If the intent is to rent the property this may allow for the mortgage and property taxes to be covered by the rent and the possibility of equity in the property over time.