I have some classes to choose from. Help me?

[Kelsey Arwen MacAilbert]

First, I need an artificer. I have it narrowed to:

This

This

This

Second, I need an engineer:

This

The Iron Clad

This

For the artificer, I need to pick one. For the engineer, I need to choose between the first two and decide whether the third should be allowed alongside them or not. It all comes down to how similar it is.

Help? I'd allow all six, but they overlap too much, so I need to choose one for each role.