I also don't buy into the need for a ring to be expensive, it's what it represents that counts. I mostly think it should reflect the wearer in an impressive way.
I find these impressive. Just 10 of my favourites!
And don't worry I signed my partner up to receive my blog posts ages ago on his behalf (he would have done so anyway but I just made sure) so if we ever we both change our minds I have saved him some time - tee hee