I think this link has great sound advise. It's hard to know where to start in choosing anything for your wedding, especially something like your Cake which is the centre piece of your reception.
http://www.voltaireweddings.ie/top-7-tips-on-how-to-choose-your-wedding-cake/#comment-9
http://www.voltaireweddings.ie/top-7-tips-on-how-to-choose-your-wedding-cake/#comment-9