I love 
Volibear, top and jungle, but I've started playing him more in the jungle recently, due to huge success with snowballing and such. Atma's is bad. Plain and simple. Shiv is okay, but it's really only good if you're ahead. Triforce is only good if you're snowballing HARD. Wit's End is really only good if your team has a lot of magic damage, and it's not a half bad item since your e and r do magic damage. Frozen Mallet is just kind of a meh item, it doesn't really give anything useful enough to get rid of something like a Randuin's Omen.
The general build is Sunfire Aegis, Randuin's Omen, Spirit Visage, boots of whatever, warmogs, and whatever you need last. Blade of the Ruined King isn't a bad item, I get it quite often. Banshee's is good. GA is great because you just don't have enough revive-esque stuff in your kit with your passive.
Getting a Wit's End seems like a better idea when you have a Sunfire Aegis when I think about it, since it does magic damage. Either way, it's a good situational pick.
Volibear, top and jungle, but I've started playing him more in the jungle recently, due to huge success with snowballing and such. Atma's is bad. Plain and simple. Shiv is okay, but it's really only good if you're ahead. Triforce is only good if you're snowballing HARD. Wit's End is really only good if your team has a lot of magic damage, and it's not a half bad item since your e and r do magic damage. Frozen Mallet is just kind of a meh item, it doesn't really give anything useful enough to get rid of something like a Randuin's Omen.The general build is
Sunfire Aegis, Randuin's Omen, Spirit Visage, boots of whatever, warmogs, and whatever you need last. Blade of the Ruined King isn't a bad item, I get it quite often. Banshee's is good. GA is great because you just don't have enough revive-esque stuff in your kit with your passive.Getting a
Wit's End seems like a better idea when you have a Sunfire Aegis when I think about it, since it does magic damage. Either way, it's a good situational pick.
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But what i can see from your listed items,you already have a good idea how to build Voli.
There are some items that i always take regardless of lane opponent.
1. Giants belt + Kindlegem
2. Dorans sheild for start (always,the xtra hp really scales well with your w) and you get more out if then form D.blade