Is there such addon? i am currently using ratingbuster to see which is best but i got to remember alot of numbers from different gears selections and combinations. so is there a addon that lets you several items and see your stats? (in items i mean not buying it but u can test it through looking at the item or an item's link)

search for "itempimper" it works great with ratingbuster, you can 'pimp' an itemlink with the right enchants/gems and have a look if it is actually better.

Good luck :)