* All modern day cameras have very good sensors and are very capable cameras. You will not go wrong buying anyone of them. We strive to buy the best entry level digital SLR but 95% of us, yes 95% of us, don't use more than 30% of what a camera has to offer. Nikon, Canon, Panasonic, Sony, Pentax, Olympus- they all make very capable cameras.
* A Nikon lover may say that Nikons have bigger sensor than Canons (22.2 x 14.8 mm for Canon vs 23.5-23.7 x 15.6 mm in most Nikon, Sony or Pentax cameras). If you see the numbers, it is only a marginal difference. This marginally bigger size in Nikon cameras doesn't prove that Canon SLRs are worse than Nikons!! Canon lovers would say that their cameras are faster. If Canon T3i takes 5 fps vs T4i which as say 5 fps. Should you care? Not really. Not for 98% of us. Most of us rarely use this multiple shot features! Then why bother?
* Camera lens is a very important component when it comes to taking nice photos in low light or in abnormal lighting conditions.
* Canon and Nikon are generally more expensive because they already have got good name. Pentax offers same, if not better, image quality at much lower prices plus you can use any old pentax fast lens on Pentax camera bodies.