Considering how well the 9600Gt scales with SLI, versus 8800GT in SLI, the 9600GT is the clear choice. It even blows away ATI's 3870 X2 which is more expensive then 2 9600GT's
That is, if your interested in SLI.
There is also purevideo and HD improvements over previous GPU's (including G92)...
You made a good choice, and a better one if you ever plan to SLI, which by current benchmarks are friggen amazing.