The Canon EF 70-200mm f4 IS USM L lens is a professional grade 70-200mm lens without the size and heft, as well as price, as found in f2.8 versions.
You get you what you pay for with the Canon EF 200-400mm f/4L IS USM Extender 1.4X: superlative performance and flexibility.
A fine camera, the Canon EOS Rebel T4i's more expensive 18-135mm STM kit (or body with another STM lens) is the only version that merits an unqualified recommendation. You can probably find better alternatives if you just want a sub-$1,000 dSLR for still photography.
A lightweight, compact design coupled with its stabilized 400mm-equivalent focal length zoom and affordable price make the Canon EF-S 55-250mm f4-5.6 IS a versatile lens for entry-level shooters and amateurs on a budget.
A winner when it comes to size, price, and quality, the Canon Elura 90 is an excellent choice if you're looking for a compact MiniDV camera and don't mind occasionally fumbling with awkward controls.