The Trulia real estate guide might be helpful to answer your sale price question.
Each specific investor purchases and maintains property at the price and level that meets their needs. Rentals are from $150 to $2500+ so the investor must decide what income range you want your investements to plug in.
Not enough information to be accurate. Would have to know more details as prices are based on the merit of the property. Realtors do CMA's (Comparative Market Analysis's) to determine values.