printing for invitations

Are you becoming somewhat confused over the array of ways to print out an invitation using a commercial printer? Maybe I can sort out a few of them. Let's start with the top,most expensive printing method. Actually there are two or more. That would be engraving,and that means that the print is raised up from the paper stock (the invitation).In order to do that two plates,generally in metal-could be copper-which makes it so expensive. One of the most popular printing methods is now letterpress. As an example,the Guttenberg bible was done by setting each letter (type)in letterpress. Now of course there are very few people that actually do this anymore. There is also blind embossing,which also uses a plate system. Then there is thermography which looks like engraving but is done by using heat on a special type of powder that rises up,giving the effect of the more expensive engraving. There is also foil embossing,and foil stamping among others. The least expensive is offset,which if done with the right font and ink can be just as pleasing.