i3u

I am looking for a laptop under 42k for a Dell model.Finally found 4 New Inspiron 15R-5521ultrabook models.Can you help me to select from one of these models? 1. with i3u at 36k 2. i3u with AMD 8730 M at 39k 3. i5u at 40k 4. i5u with AMD8730 at 43k Here is the link...