First of all I am not apple fan boy !! I don't use iPhone too ! I have Newest blackberry which cost same like iPhone 4 and I choose it instead of iPhone ! I love windows computer too, Mac is expensive and useless for me coz most of the software I use doesn't support Mac and if I want Mac supportive, I have to pay very more!

I just have one iPod from apple. iPad has 3G version too with ATT ! But like samsung galaxy x it's expensive with data package ! You can buy iPad without data plan , you don't have to hang on data package for two years!
Most of the case we don't need data plan too, I have Internet at work , I have Internet at home , gps in my car so why do I need expensive data plan!!! Waste of money only!!
Screen resolution is not so good on galaxy!
I read 28 reviews on galaxy from it's web site and most of them were saying it's not as they expected and will not recommend to friends!
Market for galaxy x is same as for other smart phone so most of the apps doesn't work on big screen! iPad has it's own app store build for iPad only!
Talking about hardware itself apple hardware is better than Samsung as my personal experience ( my two year old iPod never hang but my friends galaxy x mobile hangs everytime he tries to watch preloaded avatar))
There are some defects of iPad I know , as you say expandable memory, output, input etc but wait for lil bit of time and you will got that too!