If I buy a new iPad right now I don't think I would again upgrade next year OLED displays doesn't seem like an incentive strong enough for me to be able to upgrade. So whatever I buy now will stay with me for a couple of years atleast !
I love Samsung AMOLED screens and think they are vastly superior to any LCD. That being said Apple's LCD are one of the best and as much as I do love Amoled it's not worth upgrading to if you have a fairly new Ipad IMHO.