Hm, I haven't played the game in many months (because of reasons I'm not allowed to say - I'm not a rule breaker...
Okay, you have the two procs, right? That's 140 cast speed vs roughly 450 procced. Now, take in to consideration the amount of members in your party (I assume you're healing). If there's only 1 or 2 people, you're going to have a hard time "proccing" these items. In that case the 140 cast speed is better. Where as if you have 5 or 8... or even 10 (is that released yet?) parties, the cast speed procs should be up almost all of the time, meaning they're a lot better.
Personally, I'd go with the procs no matter what.