Well, for a plastic cage we recommend the CB-6000S (that’s the smaller one which you want unless you’re seriously well endowed – smaller is better for very practical reasons).
I also hear good things about the Holy Trainer but we’ve never had one.
For metal cages our favourite and the one hubby uses all the time is this:
It’s got lots of great features, the attractive (well I think so) construction, the solid metal ring (no pinching, yay!) and now the integrated lock which is very cool.
We’ve recently found a UK supplier (they ship very quickly to the US too) who offer fast delivery and a 30-day money back guarantee. Much better than having to buy it from China and wait for ages!
Tight Squeeze III Metal Cock Cage from Toys4NaughtyBoys
They also sell extra rings as spares so if you aren’t sure if you’re a small or medium ring for example you can get both for only a little extra. The first cage we ever bought from China was too small and so we had ANOTHER long wait to properly try it with a ring that fitted – very annoying.
You can see our in-depth reviews on our cock cages and chastity devices review page