I like the simplicity of this spreadsheet. To be honest, I've always found the "sustained dps" model the other spreadsheet follows to be, well, hyper inflated. With my gear and max buffs I can attain in a raid environment, the spreadsheet would show numbers in the 1400 range, whereas I can possibly push 940-960 on Mag near the tail end of the encounter. I understand why the number gets so large, but it isn't something I would like to see, which is the reason you designed your sheet.
So I guess which is to be trusted? I feel your sheet, when looking just at base dps, falls more inline with what I am capable of in any given instance on any given boss that sits still for more than a minute. I like how in perfect situations (read: Gruul with minimal cave-ins) I've reached 900 dps and the sheet tells me I should be getting base 877 with my current gear, no buffs, and about 932 with correct trinkets and typical raid buffs and a few potions. I feel that's more accurate than the original DPS spreadsheet which shows 990 and 1220 dps, respectively.
I'm still skeptical, but am glad there is an option to test the original.
I would like to know why you chose the dagger build you did. I have always used the following:
http://www.wowhead.com/?talent=w0efooZ0eVbbEz0MMRtV
whereas you use something more inline with:
http://www.wowhead.com/?talent=i0gcoLZMIVbbEz0MMRtV
which I really don't expect to do more damage. Mostly based off my own experience, but also of course the original DPS spreadsheet. Is there numeric backing as to why yours will do more damage? You also seem to "hardcore" the original Assassination / Combat talents, whereas you leave the remaining to be changed. Could you provide an option to modify the talents a bit more?
So far, it looks solid. I'm hoping we get more heads to bang on this sheet and work out the kinks, if any, and provide a more realistic gear comparison sheet. Great work so far.