Also if anyone has any data they'd like me to add or adjust please just let me know.

Hey guys,

So i'm new to the forums and I wanted to share something that I made.  So no Idea if links are allowed for newbies, but here we go.

http://sdrv.ms/16njy51

It is an excel sheet that pulls from the bitcoin history chart that is available on Google Docs.  When you open it and it asks you to update the data you can just hit no.  There is no more current data anyways.

It has all sorts of useful information on it, ROI on different hardware based off of current network hashrate accounting for increases.   It recalculates the difficulty every 2 weeks for the first 6 months then you can input an average based on growth percentage week over week.   

I put countless hours of work into it, so if you find it useful please donate (address is on the chart).

I hope this helps at least a few people make some informed decisions on what or whether to buy hardware for Bitcoin mining