http://www.wowhead.com/compare?items....0.0.0.0.167.2
This link compares the ring I'm after (the LFR version anyway) to the ring I currently have (my second ring is Bloodclaw Band, which is good for my spec). As you can see, even the LFR version of Asgorathian Blood Seal is better than the Timeless ring.
Although the Haste increase is attractive, I currently have 29.57% Haste on me (without BotK or any buffs). Should I concentrate on other stats, or keep stacking Haste?