160gsm is fine for backing papers but as you've learnt you need around 250gsm for a base card and then it depends on the card. It is as much to do with the density of the card. So you can have a 250 gsm card which feels sturdier than another 250gsm card. That's why when you find a card you will usually stick to it.

Like Lesley, I have just gone a bit mad and bought Adorable Scorable but with a matt finish. I just had to see what it was like and the colours were irresistible. It is brilliant for folding because it doesn't crack and I'll rechecking out yiayia's Pay Per Box, I've never heard of them.

The thing about card is you really need to have a feel of it first and since a lot of craft shops have gone you are left with buying on line.