What is the best lens for my photography style?

Why not just fill the gap that your current lens does not fill. If you want a lens that can BLUR the back ground, you will need a larger apeture. You cheapest route will be to keep your old zoom for now and add a cheap lens to use for shallow depth of field and low light settings. The least expensive lens to fill that gap will be this one a href="http://www.bhphotovideo.com/c/product/12142-GREY/Canon_2514A002_Normal_EF_50mm_f_1_8.html" rel="nofollow"http://www.bhphotovideo.com/c/product/12…/a . B&H and Amazon both have it for just under $100 plus shipping. You might be able to find a used one on eBay cheaper. But there will be no warranty. This lense will be fine for most applications. It does not ZOOM. But the best zoom is always your feet anyway. And you will have your current lens when you just have to get a little wider.