Upgrading a Sram cassette from 12 27 to 12 32

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Just looking on the Sram site it looks like to get the 32 you need the Mid sized sram Apex or the Mid sized Rival rear mech. comparing photo's I think I have the smaller Rival that can only go up to 28. (Things are becoming clearer slowly)

The question now is do I get a new Rival rear mech or an Apex both mid size cage that can handle the 32T? My gut tells me the Apex as wiggle has it for about £45 when the Rival is about £75?
 
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All parts ordered will fit the new stuff Friday all being well. I got my head around most of it except the sizing of the chain. I've seen the SRAM BIG & BIG +2 method on YouTube. Is this the same for all setups? Both short and mid cage units?
 
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