In reference to the specific question, use the Talonblade. The stats on the Strikeblade are a bit better, but it'll short you out of a _lot_ of damage on Whirlwinds by using a dagger because of the way Attack Speed Normalization works.
As a general rule, Haste functions like Hit Rating+. Hit Rating effects only white attacks, Haste Rating effects white attacks and Heroic Strike/Cleave. It's _better_ than Hit once you reach the hit cap on specials (9%; 141 without Precision, 94 with 3/3 Precision) and they cost the same number of itemization points, but it still isn't great. Armor Penetration is usually the way to go.
EDIT:
Quote:
while haste stacks with linear increases.
There are no linear increases; or, more precisely, there are no exponential increases. Every increase is linear, and every stat increase (AP, Crit, Hit) scales with other stat increases.
Edited, Jan 2nd 2008 4:59pm by RPZip