FW800 was not the performace king as many here would like to believe, it was a modest increase over FW400 after factoring in the problem with R/W performace.
S-Video is availible through a dongle "Apple Mini-DVI to Video Adapter"
Ok a little math here, 1299 retail for iMac - $900 for parts leaves $400 for other costs. Lets be optimistic and say that basic overhead of buisness and stores and all is $200... so we are now down to $200, take out OS X and iLife development so $150 left.... I would bet they are making a pure profit of $150 for retail pricing and probably $50 for educational pricing of the iMac. It's thin, but I have to imagine over time it will get much better. Using that math, in order to recoup a $100 cost break on retail pricing apple would have to TRIPLE the number of units sold.
So realisticly the might be able to cut $100 off the cost and castrate their cash flow on the unit.... real good buisness sense. Then they would have to cut something like... genuis bars, training in the stores, dropping iLife from new units, high qualiity componients, .... that would kill the basic "it just works" mentality that Apple has taken so many years to hone.
Apple already knows that it can't compete on cost, they must differentiate and they have. To compete on cost would take them down to the same level of crap that Hell, HP, Comcrap, and other big computer manufactures are. I would pay $100 more for an Apple of completly equal specs if nothing else to rid myself of XP.