A very personal choice IMO. Are you desperate to get one? If no, then wait and get one second hand later - there are a few popping up as "ex demo" which acutallly havent really been driven - if you wait it out. If you are desperate to get one, then go for it. No matter how logical you try to be about it, if you can afford it, you will want it. Have you taken one for a testdrive?
Watch out for the interest on their repayments too, it sounds quite low but they dont quote APR usually, so when you work it out, actually you could be paying a lot just for the loan. Depends on your monetary situation, for me I took their finance as I know I will pay it off early and not incur all the interest, and the scheme I am on I only have to be in for 3 months before I can pay it off when I like.