there is always a reason behind a low price and a higher one, so it's important to find out why. As I always say, arm yourself with knowledge; to achieve that, view more houses, talk to more people, ask more questions, do more reading and researches. It's not easy for anyone to tell all here with just a few sentences; no one would know what is what you do not know.
I would focus on the following:5 j; G8 r! k9 K, ?; O1 P L5 X2 \
1. location 2. House type 3. Hardware and not software of the house 4. Exterior environment. 5 v2 y% }# B, h5 ]( p5 J 5. Relative elevation of the lot 6. Front elevation of the house.