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: ( g( L B+ K! a4 W4 h# p* g; _1. location 2. House type 3. Hardware and not software of the house 4. Exterior environment. 8 e- [1 s0 M0 n1 f* r 5. Relative elevation of the lot 6. Front elevation of the house.