Definitely not as good for single target anymore. It was 141% more effective at 30 stacks than TV pre-nerf in single target. Now it's just 62% more effective at 25, and there is technically 10 seconds less time between uses, but that doesn't help much when you're waiting to use it for Crusade.
That ring looks pretty good now, especially if I can get T20 along with my T19, although ilvl of off-set gear might just outweigh T19 anyway. Also, haste at 30% is totally doable without sacrificing that much stats. You probably don't want anymore than 30% though. I notice a severe drop-off past 29.5% on my character if I manually add more haste to a haste gear set I have.