Hi,
no offense but your question is incomplete at best.
In general microcontrollers with -40/85C temperature range are considered industrial.
Now, there are 4-bit microcontrollers and if I am not mistaken 64-bit micros and in between 8/12/14(PIC)/16/32 bit micros.
Cost is relative to what you need to do and again in general, a single chip solution generates less noise than one with an external bus.
So, my questions to you:
What do you want to do with the microcontroller?
Is this any volume production?
The question about the volume production is because it is worth to trim software to a minimum for large quantities saving 50 cent on the micro but investing weeks and months in the software.
If it is a project let's say 100 pieces, investing the time to save 100 times 50 cent would be a little wrong.
So, may be someone can help you more with more information from your end first