Recently I have become interested in spatial effects on house prices (how where you are in town affects your house value). I haven't quite gotten to the spatial elements yet but I was able to run a quick analysis on house prices vs. square footage, bedrooms, bathrooms, and acres. Data was taken on 11-1-2009 and includes the vast majority of MLS listings for Bozeman at that time. I made a calculator based on the regression that can be found here. 

n=931

	Price	Sq. Foot	Bedrooms	Bathrooms	Acres
Min.	19,900	437	1	1	0
Median	$329,900	2,214	3	3	0
Mean	$530,991	2,676	3.373	2.84	3.086
Max	$10,950,000	16,428	9	9	185

**Update 11-6-2009:  The predictive algorithm has been much improved.  I also added an option for Belgrade homes on the calculator which can be found here.