Sorry to dissapoint but SED is DEAD - Canon has postponed the technology indefinitely. Although Sony says it will start limited prodction of 11" OLED tvs by 2008 bigger sizes are not expected for a couple years.
Looks like its going to be LCD/plasma for a few more years. Look for LED LCD's (better colors/blacks), laser projection (2008?), 120hz LCDs (less judder/smear).
Yes, LCD monitors with LED backlighting are indeed expensive. Typically 3x - 5x the price of LCD monitors (of the same size) with convential Cold Cathoray Florescent Lighting (CCFL). That is the price of new technology.
These types of monitors are currently geared towards the professional graphics market. In my opinion it will take at least 3 years before these LED LCD monitors will become price competitive with standard CCFL LCD monitors. Meaning when LED LCD monitors only cost $100 - $150 more for the same size monitor using the same type of panel technology.