I'd start with pants. get some with str+high vit (200+ish) instead of str+dex. I think, inna's are not really good for barbs, there are better rares.
then boots. vit + high str (200-230ish), instead of low str.
hands also have pretty low str. 180ish should also be possible there.
chest: same as pants. medium str, high vit.
all jewelery could be better. basically a bit more from everything, plus add average damage (about 40+ per piece).
belt could have more stamina, and instead of frenzy damage, pickup radius (which is not possible, for immortal king's, I know...)
bracers: cut the poison res and increase str. maybe even aim for some good lacunis for more runspeed.
i'm not exactly familiar with the head, but try to get one with actual low fire damage taken (since is the damage YOU take, and not your enemies), and all res instead of poison res.
actually try go get rid of all your poison resistance on gear. you're not a monk, you're a barb. if you have a second res besides all res, take physical or fire. or even better: armor instead of a special res.
In a nutshell, I'd say 2pc IK is enough, gloves + boots for example. maybe gloves + helm, the helm is also pretty good, if you get one with 170+ str and maybe vit as random stat.
and beside that, I'd also like to have like 3 legendaries + 5 set items on my char + 200 mio gold, not knowing what to do with that.
read the common guides, there are plenty of guides out there. maybe even take a budget guide. just increase the stats and add more resitances and crit / attackspeed, and boom, you will get items that cost more than mabye 150k, so you can spent your gold properly.