I paid around 16 500 for my
NHB Executive (closest we have to EX) with blue footwell lighting, parking sensors, travel pack, extra set of alloys with studded winter tyres. But that was without the 0% interest deal.
Work out what you would be paying in interest somewhere else and use that number to compare.
I am guessing it is more than 200.
But you are better off with some local UK input as prices.
Taxes and things vary.
The 08 EX has parking sensors as standard.
Go for the 08, it will be worth more when you sell too.