4wd Driveshaft U Joints
 

I had a pretty nasty clicking from my front end and found quite a bit of play in my middle u joint on my front drive shaft. I have already dropped the shaft out from under my truck. Should I go ahead and replace all 3 u joints while I have it on my work bench or hold off and do the 1? I have 198k - They are original parts to my knowledge. My gut tells me to do all 3 but just want ideas. Any brand suggestions that may have a grease fitting also? Thanks in advance!