I got my 11" MBA Saturday at the Mall of America Apple Store. I asked them if they had any models other than the 4 standard. The guy said no. I had thought about upgrading it here and there, even though I felt I didn't need it. I only used 28 GB of hdd on my old MacBook. On my MBA, iStat has just barely gone over active/inactive ram. So, I'm quite sure the $999 model will serve me well.
The big thing for me is I really wish it had a newer processor. I thought about waiting until they could fit a Core iN and fancy graphics. Problem is that could be 2 years. I will stick with my $999 MBA and maybe upgrade in a year or 2 if they come out with something drastically better.
Which they of course will....
store yesterday. A gal told me they had an 11" in stock with 4GB of RAM. 2 hours of a drive later showed me just how misinformed or conniving - or both - these "geniuses" really are. As I figured there was no such machine and according to the store GM they never had such a machine saying "those currently are only available as BTO online". Thankfully there is a Cheesecake Factory at this mall so the trip was not a total loss.