It is extremely unlikely that you will find any processor that exactly meets all your requirements - therefore any choice is almost bound to be a compromise.

The two biggest constraints are likely to be power and cost - you might find something that does everything you want but requires too much power and/or is too expensive.
This is where the real Engineering challenge begins of finding the solution that best fits all the criteria - ie, the performance is good enough at an acceptable power/price budget...

It has been said that a Real Engineer is someone who can make for $50 what any fool can make for $5000...