Hi Roy and welcome to the forum....
This is the section that refers to your model of A3....
A3/S3 Forum (8L Chassis)
Use the stickies at the top to have a loot at the FAQ thread and also the search bar in the top right to find anything specific.
Lots of info on all the parts you refer to, DV (OEM can be argued is best), Engine mounts (few different upgrades/alternatives, and suspension (again many different brands/options and depends on your budget).
I actually can't see the picture of your car at the moment due to being at work, but if you have a look in your boot near the spare wheel there should be a sticker with all of the information about your car. On that there should be be a paint code No. which will be a few letter/numbers. Chuck those in the search bar here and you should be able to find what its called