Id do the whole knuckle replacement too. start soaking all the fasteners in some penetrating oil and keep soaking them frequently until your replacement parts arrive. might as well do the upper and lower ball joints & wheel bearings since you'll already be in there.
Seems to me that I went with dana spicer when I did my ball joints. I know theres some concern out there about the need to be a little fussy when selecting the correct ball joint. If remember correctly, incorrect designs on select brands can do some damage to the axle where they press into it.