1) What I want
2) What I need
3) Where I need it
4) Then figure how much am I willing to pay for 2 and 3, and what can I afford over a specific period of time
5) Now start really looking when you are clear with 1 - 4.
Following these points will save you alot of time and money.
If you are looking at a realtytrack listing forget it. You can not buy it for the price listed here. It is not accurate and often not for sale at all. Often the numbers are how much someone is behind on their payments and they could pay that any time.