What kind of luggage do you use for the kids. We are going in April 2010 and wondering if I need to start watching luggage sales. It will be DH, myself and DS10 and DS8. I do have luggage for DH and I. Went to WDW 4 year ago and used little travel luggage on wheels for the boys that measured 18" x 12" x 7". I don't think it will be big enough for all there stuff for 8 days. Any suggestions?