What are the best/most useful items that you can get from the prestige shop and at what level are they available?

[Oscar_Muffin]

As the title says . What would be your most useful items available from the prestige shop and at what prestige level are they available? Also, can I get multiple prestige levels from the same profession or does every level require a different profession to be levelled up?

 

[Charlie Fox]

Bergen at level 3 

lvl 5 Rig at level 10

Those are the important ones.