Church's are worth the money. They can be rebuilt 2-3 times, they are super comfy (if you find the right size and last for your foot – there are lots!), and nicely made.
However, they aren't expensive because they are robust. They are expensive because they are British, hand made, use suptuous leathers and last well if looked after and not subjected to too much abuse. They are probably no harder wearing than your Paul Smiths.
They do a few specific styles with extra thick soles, but they do weigh a lot. They also do some rubber soled versions.
The truth is that you will probably get slightly longer out of Church's, but at the rate you get through them, and driving as much as you do, you might end up disappointed.
Having said that, I have had many pairs of Church's rebuilt (they replace virtually everything except the upper), and have always been impressed. That is one advantage to buying Church's is that you can send them directly back to the factory in Northampton and they come back as good as new. So, your investment might pay back even if you wear through the soles quickly.