Canon DSLR cameras come in 3 different target groups, which results in 3 different price brackets. 
Ill attempt to summarize as simply as possible what these groups are and hopefully clear up any confusions you may have with the Model numbering.
So you’re a home user , your not an engineer , your not an admin but you’re a computer enthusiast , you wouldn’t have a clue what RAID 5 Parity is , but you know what an IDE device is. As an enthusiast your computer is a massive part of your life. You keep everything on there. Your photos, your videos, your emails , your porn …. All the important stuff, but as any computer enthusiast, engineer, admin, tech will know … Hard drives just don’t last. Iv had hard drives only 3 months old die on me, yea sure I can get it back on warrantee, but who cares? IV LOST ALL MY DATA ! , I couldn’t care less about the price of the hard drive, it’s my gigs and gigs of photos and music iv lost that’s got me tearing my hair out.
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