What features do you look for in an I-POD

I have a 4GB iPod Nano, and it's a good iPod. It's able to store movies, tv show episodes, photos, games, and of course music. Only problem is that I've filled it up. All my fault. I shouldn't have so much music in my iTunes library. I've been thinking about getting the new iPod classic that has like 150 GB of space to use. That's more space than my laptop. I could practically use it as an external hard drive.

There are so many I-Pods on the market today that one doesn't know which to buy. The biggest reason for me is for it to be user friendly. It must be easy to operate. The next thing is the capacity of info, data, music, photo's or video that it can store. The last thing that I'm looking for is the brand. It must be from a trusted company like Apple for instance. The retailer where you buy your product must also be giving you good after sales support.

compatibility with other bluetooth devices .. i find the BT capability of the iPod useless ..