you say you are going to buy a spare SD card. If you do, don't you DARE buy it from Dell. Go to
Buy.com. Don't worry, the prices might seem unrealstic, but I've been a happy customer of theirs for a couple years. I recently ordered a 1GB SD card for $20 after rebate and a 2GB CF card for $50 after rebate, with free shipping.
And another thing. CompleteCare is absolutely unneccesary. Any damage that may be caused by you dropping it can easily be blamed on something else. The tech people may appear to take it seriously, but they really don't. But, if the X51 is anything like the X5, the chance of ANY damage from dropping it is negligible.
And a last thing, on the WiFi Companion. Never heard of it, and I really don't think there is much point to it, from what I HAVE heard of it. The WM2003 Wi-fi connection manager, although sparse, is very easy to use and unobtrusive. I assume the WM5 connection manager is, if anything, only more refined.