Cho'Gath Strategy

So I had a mild epiphany the other day. I decided to play Cho'Gath in top lane versus a Karthus . Knowing that I didn't want to hit all of his Lay Waste bombs for every minion I would try to last hit, I opted for my first item to be Ancient Coin . This way, I figured, even if Karthus can zone me with his abilities (I know Cho can zone enemies very well too, but I can't as easily prevent him from farming with Lay Waste), I will still get some gold from the item's passive and I would get the health bonus on top of Cho'Gath's normal passive. So when I do last hit I get my passive, when I don't I get the item's passive. I was rarely ever below 75% HP with this setup. I used it again versus a Ryze and even though he could burst me pretty low, I would quickly come back to full HP after a few waves of being careful not to take any hits. Meanwhile I was able to pop a few shots off on him. My first game I ended up going 20/4/11 and the second one I went 4/0/8. I'm pretty happy with both. Thought I would share this idea, maybe it's been said and done already, but this I only recently picked up Cho'Gath after quite a long time of not playing him and I haven't looked into anyone else's builds for him. Enjoy, hope it works well for you guys too.