If you guys read my blog, you will notice I really suggest getting a 35mm or 50mm prime lens to get the maximum SLR experience for cheap. Getting a prime lens really help you to make decision for your next lens choice. While you find the 50mm is too close to your subjects which you normally shoot, then you need to get a wide angle lens; While you find the 50mm make you walk closer to the subject, then you need to get a tele lens.
Actually, if you don't agree my point of view, there is another solution for you to find out what lens you should get. You can go to the Tamron website "here" and use the tool they build for you to understand what lens you need. Following is how the website looks like.