You are right that you should start something. One thing I didn't think of before is that it may take time to get things through your insurance as they are likely to stall in an attempt to save some money (while your numbers continue to increase).
As for the choice, I have taken both (although the Tasigna was brief). I think the experience varies for everyone. While I was on Tasigna I developed a skin rash that irritated me more every day until I stopped taking it (due to liver intolerance, not the rash). I am much happier with Sprycel so far (although every time I feel any shortness of breath, I wonder if it is pleural effusion). The 6 hours a day that you can't eat also means mealtimes are pretty rigid while taking Tasigna. You have to plan your meals around your medicine. That may be an important factor in your decision. I was certainly happy to say goodbye to that constraint.
