Hi, welcome to the Windows Phone community.
There are many many posts on other threads about this topic. I suggest you read as many as you need, to feel that you have the answer that is right for you.
That said, I suggest the Nokia Lumia 822 with the Navigon Navigation App. The Lumia 822 is a solid great reasonably priced phone and Navigon is the very best full featured navigation App that I think, is worth twice it's price. The price, is high compared to other less functional Apps, but it does go on sale at half the price, from time to time. Read and decide what works for you.
My Lumia 822 is the best phone I've ever had and I've tried many navigation Apps over the years.
Best Wishes.