I would go with your original plan and get the speedy and the eva! That way you don't risk upsetting your parents on such a great trip! If you are really set on the Palermo, you could discuss your options with them now, well before you go, tell them that maybe you'd just like to get the Palermo and no speedy or eva, however I think you'll have more fun with the speedy and eva than the Palermo, and no on gets upset! Have fun on your trip, can't wait to see your reveal when you get back!