My MX5 I had before the Zed was a lease car, there are pros and cons...
I had non-maintained lease over 3 yrs @ £305 a month. I has the mileage upped to 18k, after the 3 yrs and I had paid about 11K in rent so to speak, if I wanted to keep the car they wanted 14k.... mmmm 11+14=25 for a 21k car Also as I was over mileage I had to pay 9p per mile extra and I got stung £185 for Car Park Rash !!!!!
I now have a Finance on the Zed ....... which I get to keep after the 3 yrs are up
If you are willing to pay the £400+ a month plus 2-4K deposit on a Zed Lease you would be much better off using your Zed + Cash as a deposit on a new one then spend that monthly money on Finance/Personal Loan... at least it will be yours at the end .... and you can Mod it
I don't think I would lease again. If you do want to lease, I would phone around all the leasing company's and wait till one turns up which has been returned with a few miles on it (Original leaser did not like, could not afford, defaulted payments etc.). You will get it at a reduced lease price.