Castcore,
Location of comparables is important (the closer to the subject property the better), but there are other factors which are equally as important.
Here are a few more questions for you.
Were the other sales on your street within the past year? If not, it is possible that they could not be used for that reason alone. The more recent the sale the more likely it will reflect the most current market value, assuming it was not a distress sale (divorce, foreclosure, etc.).
How does the square footage of your home compare to those other homes on your street? Larger? Smaller? Basement square footage is not as important as above ground square footage, and generally basement bedrooms and baths are not as significant as those which are on the main living area levels. Walk-out basements tend to command a higher value than those which are not walk-outs.
What is the style of your home compared to the comps that the appraiser chose? In my market area a ranch-style (all on one level) home sells for significantly more per square foot than, say, a two-story home, and a bi-level design is worth even less than a two-story.
How about the age of the home? Is your home older than those other sales you mentioned?
How do the views that you have from your home compare to the views of those other homes? In my area two homes can be right next door to each other and almost identical, yet one will have a superior view that could potentially command as much as a $50,000 price difference.
It is not always as simple as choosing two other sales on the same street and considering them as 'comparables', particularly in high-end neighborhoods where the homes are custom-built.
My last question is if the comparables chosen by the appraiser were within your general neighborhood. If so, take a very close look and be honest with yourself. Are they more similar to your home (square footage, design, views, age, etc.) than the ones that you had hoped would be used in the report? This is something only you would know, as no appraiser on this forum can possibly estimate a value based without a full inspection of the property and analyzing the neighborhood market.
Every appraiser knows that there are other appraisers out there that are incompetant, but most homeowners don't always realize that a home that sold right up the street isn't necessarily a good comparable sale to be used in the report. Choosing sales that require major $$ adjustments for any of the criteria that I listed above will often throw out red flags to the investor, especially if there are homes that require fewer adjustments because they are more similar to the property being appraised but are deliberately omitted from the report. For example, if the home being appraised is a 2000 SF, 2-story home built in the 1970's and all of the comparables are 3,000 SF ranches built in the 90's (even if they're on the same street), it would probably cause quite a commotion with the loan underwriters, especially if there are homes more similar to the subject property that are a few blocks away that sold for significantly less than the comparables chosen.
Choosing comparable sales, if done correctly, is much more complicated than most homeowners realize.