Seriously, with the type of machines you've described there (except for the Adv. Machines), we'll need something even more advanced than GT Highlyadvanced Machine Blocks. Something that costs 4 Nether Stars and 4 Iridium Plates, for example. Let me calculate the expenses. (Rates are in default IC2 without GT)
Gravitational Generator "does not gen alot" but it is still a Green Gen, and it happens to be kind of cheap, as I have no idea what "not gen alot" means. To me, at the end game, "does not gen alot" is roughly 400 EU/t. I have no idea how much it costs, due to you didn't specify how much iron it needed, but I shall assume you mean fill the rest of the recipe up with iron. It will cost 115.10 UUM to fabricate from scratch. And by the endgame, I doubt you have so little of the below ingredients.
- 4 UUM
- 1 Lapis Lazuli
- 9 Redstone
- 84 Iron
- 32 (Cobble)Stone
- 16 Tin
- 2 Copper
- 1.33 Sticky Resin
- 5 Wood
Dragon Egg Scanner costs 53.35 UUM.
The other scanner? costs Integrated Platings which don't exist anymore. However I shall assume you are talking about the Reactor Plating. That costs 28.33 UUM.
The stand is also very cheap, at a measly cost of 33.78 UUM.
Altogether, they only cost 115.46 UUM to fabricate from energy.
- 71 Iron
- 38.5 Copper
- 3 Glass
- 6 Coal
- 13.5 Tin
- 2 Sticky Resin
- 2 Redstone
- 0.25 Wood
With this minimal cost, I expect at least 5x10^8 EU to create a Dragon Egg, as it is meant to be a treasure.
Additionally, if you want more dragon eggs... there's something called /give, or TMI, or NEI.
Nova Smelter:
Where are the Nether Stars in your recipe? Or other they used to heat up the furnace?
Additionally, it can be abused. Have you ever heard of something called smelting cobblestone to get stone, placing it and breaking it without silktouch to get cobblestone?
Your recipes are again, too cheap, at 147.00 UUM to fabricate from nothing.
- 89 Iron
- 59 Copper
- 18.5 Tin
- 64 Coal
- 5 Wood
- 10 Redstone
- 4 Glass
If you plan on the Nether Stars to heat up the furnace, I would advise that they last for about 40 operations per Nether Star.
Abstract Compressor
- 376 Iron
- 33 Copper
- 73 Tin
- 9.33 Sticky Resin
- 40 Redstone
- 140 (Cobble)Stone
- 4 Lapis Lazuli
- 16 UUM
The abstract compressor is slightly more balanced than the others, at 538.44 UUM, however I still think it is unbalance, mainly because of the infinite Compressed Coal Ball and Advanced Alloy part, as 1x Sand --> 1x Sandstone. And if you think of it, sand is nearly infinite in deserts, and infinite in macerating cobblestone.