Need to provide a little more detail in what you are looking for in a phone.
Lumia 820. It is cheap and has microSD.
Still a very vague request. What is good RAM? What is a decent camera? What is a lot of memory? There is a whole lot more in choosing a phone than even these questions.
Want the best camera? 1020
Want expandable storage? 822/820
Want a huge screen? 1520
Want affordable? 620/520
And still, there is much more to it.