You may want to look at the overall price as 6 up front on a 24 month works out to be about £242 per month plus VAT when total costs are spread over the 24 months.
You need to add about £14 per month if you want metallic paint and if your looking at 3 years or longer the 3 year service pack works out to around £10 per month.
I found when I was looking that the price quoted on the site wasn't necessarily the price offered when they actually quoted and in the end I found Mitsubishi were quite competitive.