How did you calculate these estimations?
People usually have different ways of calculating out their predictions. For my old calculations [urlhttps://docs.google.com/document/d/1L8hKZinune9Cc7tWY9Pmx8J17BOxor7QNQAV03xROOc/edit]back in August[/url], I went to the top 5 largest mining pools and figured out what percentage of the pool's hash rate was generated by miners with fast rigs/setups. I then assumed that these people would be the ones to purchase the fastest ASIC devices. A bit of math later and I had my own prediction of 150TH/s to start, going up to 250TH/s over 6 months or so.
But again, this was back in August. I'll be updating my docs based on all the new info that's come to light within the last 2 months. I imagine my numbers will be a bit higher this time around.
(If so, where can I find it?)
http://bitcoin.sipa.be/
https://spreadsheets.google.com/pub?hl=en&hl=en&key=0AmcTCtjBoRWUdHVRMHpqWUJValI1RlZiaEtCT1RrQmc