Probably not if you factor socket bonuses in. All the other stats are kind of negligible so, you'd basically be trading 1.5% crit for 47 mp5. I'd honestly say it's more personal preference until you get 277 tier. If you want to wear your shiny new gloves, go for it =D. It's really not going to hurt/help your healing much one way or the other TBH. If you don't have dual solace, I'd say you definitely want the extra mp5 for LK though.
p.s. Yeah Jaraxxus is a dick, we went 8 long months without him dropping a solace after the first 2 we got.
---------- Post added 06-22-2010 at 12:49 PM ----------
It really doesn't matter, it's not worth swapping out for the extra haste when you're full 277, it's not really going to do much.
Example with "too much" mp5:
http://www.worldoflogs.com/reports/a...?s=4873&e=5113