I purchased an M Audio Micro Track 2 Portable Audio recorder today to begin recording all of my concerts on my upcoming European tour and the guy who sold it to me said that he used a 4 gig Compact Flash card with it which, he said, gave him the ability to record two live concerts sets on it without dumping memory onto a computer. I went online to find 4 gig flash cards and found ones that cost $21.99 (A DATA - http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3281680&Sku=A208-1172) and ones that cost $89.99 (San Disc Extreme III - http://www.memorysuppliers.com/compactflash.html?gclid=CKK79Mnwi5ECFScXagodeC3PFg Is there a huge difference between these? Are there things to be worried about in buying CF cards? Things to avoid? Do you all think it would be better to buy a couple of 2 gig cards instead of one 4 gig card? I'm a newbie when it comes to this subject and could really use your collective expertise on it. Thanks, in advance, Rick