Kitchenaid Advice please!

[Jayne75]

Morning.... Thinking of investing in a Kitchenaid food processor and just wondered if anyone can give me some advice please. I'm a bit confused as to whether to go for the Artisan 4L one or the 3.1L one. We are a family of 5 so thought the larger sized one - although is this worth the extra £130 I wonder? - and does the larger one do anything else that the smaller one doesn't? Any help most appreciated please. There doesn't seem to be any promotional codes on these at the moment though - just my luck!
Thank you in advance
Cheers