While I sent Yurkie a PM, I realize he is probably busy. Now that I have done a little more reading, I take it the F-18A mod is a straight up VGA connection. Is one better than the other (RGB). I do not have the skills (or time) to install something myself.
If they both work with the SGM, that is great.... but I assume neither works the 2600 expansion module.
I am holding off a bit to hear back from Yurkie regarding options before I pre-order the SGM. My CV is in very bad shape... and it may be worth seeing if I can get something from him outright rather than trying to work with mine.
The F18a is a VGA connection although I also have an option to have a VGA to HDMI scalar built into the system so that the system outputs HDMI. The SGM is fully compatible with the F18a upgrade. The 2600 module does require a separate video connection either through the RF output or a separate composite mod.