I have the new 8900 Blackberry Curve, do I need a iTouch or just get a regular iPod?

I have the iTouch already and love it, but taking both with me all the time is sometimes a pain. I love the apps and the way things look on the iTouch, but far as like email, memos and notes, calender, contacts, youtube, weather, calculator and internet, i can get on my blackberry. I'm currently with T-mobile and wanted to switch to att just to get the iphone but plans are way too much for what I pay with T-mo. So thats were the iTouch comes in. iTouch or iPod? Thanx for reading.