The problem with Hi Ho is that the rest of the song is largely irrelevant, and other than shouting Hi Ho Aston Villa a couple of times there's nothing much to sing along with.
I tend to agree in that I don't think many know the song other than the chorus but! I found these lyrics somewhere - probably this site. I don't know if they are definitive or if definitive lyrics even exist to any song, but here's what I sing:
We're everywhere that you are Villa
That's where we're at
We're the Holte End behind the Villa
We're at every match
Up and down the country
We will sing this song
When you get behind the Villa
You can't go wrong
And it's...
I voted for The Bells Are Ringing. Not an anthem from my time, but one that has the (potential) grandeur to suit Villa.