I know the Curve will only see 4GB of the 8GB. But what are your thoughts of if and when the 4.3 OS will come out for the Curve? I've just been debating on if I should get the 4GB card or just opt for the 8GB.
It depends what you are using the phone for. I currently have a 2GB card in my phone and never come anywhere close to using it's full storage space. I use maybe 10% of so of the 2GB for a bunch of ringtones and whatever pictures I may have on the phone. However, with 4.3 on the way and video capture becomming possible, you may want the extra space if you intend to use that feature a lot. Also, if you are using the phone as a media device, eg. MP3 player then the extra space will be welcome. Flash memory isn't cheap at the moment so that's why I stuck with the 2GB, although the 4 is pretty reasonable too; just don't need all that much space if you are focused on the business aspect of the phone.
"Once you go BLACK (berry) you'll never go back"