in my healing trials i have come to just mix all 3.

i love crit. i like being able to swap gear with my sch and the big numbers are pretty beyond the big numbers, it is nice to crit and in turn save mp due to fewer casts needed.

i like spell speed... for certain things. when i was 1st starting whm it helped in my reaction time. when i play with less than great players it helps to get them back up. but as many have said, everything is scripted. so if you happen to run w a steady (good) group, spell speed wont be as useful. pug with randoms that have 'lag' or dodge issues and it can come in handy. i will admit that when i first started replacing SS pieces that i did feel so slow.

det is ok. it is your fall back stat in my eyes. it just takes so much to matter that i end up prioritizing it rather low. i would rather have an extra 1% chance to crit then to have a dedicated +15 on each heal.