Yea, I noticed the feralheart looks far better for a resto, as it gives spellpower. Maybe if I come across a lot of these wildheart I'll try to upgrade them, but I wont go out of my way to buy the 75G belt in the AH right now. ;D
Yeah, if you are going to collect them then it really is just for novelty value. At 80 you can easily solo all those instances and just farm the pieces yourself - actually, that sounds like a bit of fun for all my alts - imagine 10 toons rocking around Dal in 8/8 upgraded :)