Looking for comments re SD memory cards for Treo 600.

What is difference between their ultra II vs regular SD, besides huge price difference...and for someone who is going to use it primarily for storing/backing up applications, some pictures and email files (no music needed as I have iPod), does it make a difference?

I've read elsewhere to watch out for the Sandisk models, some of which are made in China and have poor QC, and stay away from Sandisk completely. Instead, suggestion is to buy the more expensive but better quality Panasonic brand.

I think 256 MB will be enough for me, although for same price as Panasonic 256 MB, can get either one 512 MB Sandisk Ultra II or two regular Sandisk 512 MB SD cards!