Hasta La Motion!

im after a camcorder to use for recording my own footage for practicing my nuke ( greenscreen, tracking, roto etc) at home as i am currently being taught it at a London studio.
im not looking for anything like a HVX200 ( having used them for years at uni i know there great but well out my use need and price range)
the most i will ever use the footage is practicing, if push comes to shove then maybe a bit in my reel.

i’ve got a budget of £600-£700 at the most.

using the search on the forum, i’ve found alot of talk about the canon’s HF s10 and the HF S100

why do they keep coming up and what others should i be looking at.

Thanks all for the help
Theo