I was wondering if anyone here had added a sprinkler system to their home?  I have the plumbing background and the floorplan is relatively simple.  I also have sufficient room in the crawlspace for a water tank. 

Any input would be appreciated!

Depending on the size of your home and # of stories and current water pressure the sprinlker system could easily take a 2" water supply. Residential systems can be piped in PVC.

I am having a sprinkler system installed in a new home. What sort of input would you like? I can probably help you, with what I have seen from my sprinkler contractor. Jeff

I had a great result hiring a design firm independent of install companies. Contractors have little incentive to optimize when another six sprinkler heads means less liability (in theory) and more work. Seriously. One contractor wanted 27 heads, a 300 gallon tank, a 3-hp pump and long runs in an unconditioned attic for my new construction of 1600 SF. Aquatech did it with 16 heads, a 200 gallon tank, a 1.5 hp pump and exactly three feet of pipe in the attic. (http://www.aq2000.com/)
Getting the job done is codespeak for meeting NFPA 13D standards for residential sprinkler systems. You should look at the design criteria even if this is voluntary on your part. Basically, the code calls for 10 minutes of fire suppression at any point in the house. The hydraulics of delivering adequate pressure at every head requires considerable math -- or a substantial overdesign. I dealt with Aquatech through pdf and Autocad files via email. Retrofit would be trickier. The designer would probably need an onsite inspection. Try the National Fire Sprinkler Association for a member near you. http://www.nfsa.org/