Does the quelity of the item to enchant affects the power of the enchantment?

i.e. does a ring that cost 500 gold produces stronger (or potentialy have a higher enchantment cap) then a simple ring worth 20 gold ?

Nope, its your enchant skill and the size of soul gem that count.

(edit - sorry, the size of the soul IN your soul gem that counts)

Your enchantment skills determine the strength and the gem used determines the charge it holds. Item quality does not impact the enchantment itself.

No, the power of the enchantment itself is based on the Enchanting level I believe. The quality of the soul gem is what determines just how strong of an enchantment you are able to put on it, but not how strong it actually will be (since that's Enchanting level).

Now that you mention it, yes item quality should play some factor in how powerful your enchant can be.

thanks guys.

in Morrowind the quality of the item defined the cap (maximum possible) for any enchantment.

so I guess the quality of diffrent items in Skyrim only matters when you sell it to traders

I never enchanted anything, i rely on pure power.. lol.

But in my next play, i will enchant i think..

Indeed - this time round it makes more sense to keep and enchant your rubbish plain ol' silver rings, and sell all your jewelled golden amulets for more money.