Excel Spreadsheet for Deal Analysis

[Jeff Weissman]

Anybody out there who is an experienced rehabber willing to share an accurate, modifiable Excel spreadsheet with me? I'm looking at lots of houses ripe for rehab & need a quick & accurate way to evaluate them in order to decide whether to invest more time to hone the numbers, decide if there's sufficient profit to be made, and make an offer. I'd like to be able to plug in a house's sq. footage, the price per sq. ft. I can expect to sell for (based on my analysis of comps/BPO/CMA), my MAO (max. allowable offer) or PP, the private equity financing costs coupled w/ my down payment, my estimate of rehab cost and have the formulas in place so the spreadsheet will calculate approx. before tax net gain on the deal both in hard dollar terms and in % ROI.
I've looked, but haven't found any decent, free, online spreadsheets or calculators to do this. Stayed up most of the night last week trying to design my own, but lacking an accounting or finance background found the task daunting!
Any help with this would be much appreciated!!! Thanks in advance!!! :D