How much profit is too little?

[Daniel Hixson]

Im looking to buy auction and preforeclosures that sell for around 120k after repairs. I live in south texas ans its considered one of the poorest area of the country. So most people buying are around the 80 to 150 range. What should i be shooting as far as my ROI. 10% seems too little based on all the investment and time and 20% seems to be closer to what i would consider acceptable. Am I overshooting here. What is your opinion on what should be a good return on a 100k investment and risk.