If you visit dell website for an entry level laptop, they are bound to make you confused with various bits of information. To start with, they have categories like Vostro, latitude, Inspiron, XPS with no clear hint as to which one stands where. Then the website urges you to go through categories for Home, SME and Large businesses. Almost all of these are listed there.
I was in the market for touch laptop for programming purposes and faced with this massive confusion, called them and got clarification on few things.
So Vostro and Latitude series have no Touch screen options and they are in the higher range series. Perhaps, these comes with enterprise class features like Bitlocker etc and more warranties. XPS ultrabooks are in very high range. That leaves Inspiron only. In Inspiron again, They have R series, Inspiron 14R and 15R, and normal ones, Inspiron 14 and Inspiron 15. R series laptops comes with metal body while Non-R comes with fiber body. R series definitely costs more. Functionality and configuration wise both are equivalent.
I went with Inspiron 15.6 inch screen 3521 which comes with 4 GB RAM and 500 GB HDD and 1 GB dedicated graphics. Hope this is a good purchase.