In the right ballpark for my CapEx estimation?

[Kevin Nguyen]

I am trying to start the process of deal analysis and have come up with estimates for CapEx in my area. I broke it down to the individual components to understand how people usually estimate it. This assumes that everything is new and thus the items will be utilized to it's max life. I will be looking to buy homes from 1200-sqft.-2000 sqft. Please pick my estimates apart. Items that have a long lifespan like a driveway, I can always save for later when I have more homes to subsidize the cost.

http://www.nachi.org/life-expectancy.htm

I used this site to estimate most of the lifespans. 

Water Heater: $900 x 10 years

Roof: $6,000 x 20 years

AC: $6,000 x 15 years 

Furnace/heater: $3,000 x 10 years

Paint: $2,000 x 5 years

Flooring: $2,000 x 10 years (Laminate) 

Washer/Dryer: $900 x 10 years

Refrigerators: $500 x 10 years 

Dish Washer : $350 x 9 years 

Am I underestimating the cost and life span of these items? 

How often do you repaint your rentals and how much does it cost?

Anything that I forgot?