Theres no worse feeling that grinding away to finally build XYZ machine, to only use it once making something better to replace it.
Some machines will become redundant such as the stone multiblocks and the Gtech steam machines.
Top priority are the multiblocks (given the amount of time/resources needed to build them)
ImEng Arc Furnace (optional build)
End of tech tree branch.
ImEng Crusher (optional build)
Has its own space in the ore processing line.
ImEng Excavator (optional build)
Useful continuous source of materials.
ImEng Generator (optional build)
Useful lategame power output
ImEng Metal Press (required build)
Sheet metal rolling
(not the end of the world, since its a fairly small multiblock)
Impet Distil tower (required build)
Has extra recipes to cut down the number of Gtech distil towers needed.
Needed for crude oil processing.
Impet Pumpjack (recommended build)
Needed as long as oil is needed.
Could look at a late-game use extracting liquid antimatter from some other dimension
ImTech Solar Tower (optional build)
Useful to keep around
Imtech Turbine (optional build)
Useful power output
Gtech powered multiblocks (required builds)
Stock Gtech keeps these useful throughout the game.
Loss of large boilers are more efficient versions become available.
MM multiblocks
Upgradable, fully recyclable
Railcraft (optional builds)
tanks are useful
boilers/turbines might become a loss after a long time
rock crusher is disabled.
Single Blocks
Forestry
Thermfab used to make few other components? Few more uses for E-tubes?
Carpenter needed for woodworking/wood treatment
Gtech
Steam machines can't be reasonably kept.
LV/MV machines still find their uses later on.
Railcraft
Rolling machine needed for thick/heavy plates, mixed ingots
Theres no worse feeling that grinding away to finally build XYZ machine, to only use it once making something better to replace it.
Some machines will become redundant such as the stone multiblocks and the Gtech steam machines.
Top priority are the multiblocks (given the amount of time/resources needed to build them)
ImEng Arc Furnace (optional build) End of tech tree branch.
ImEng Crusher (optional build) Has its own space in the ore processing line.
ImEng Excavator (optional build) Useful continuous source of materials.
ImEng Generator (optional build) Useful lategame power output
ImEng Metal Press (required build) Sheet metal rolling (not the end of the world, since its a fairly small multiblock)
Impet Distil tower (required build) Has extra recipes to cut down the number of Gtech distil towers needed. Needed for crude oil processing.
Impet Pumpjack (recommended build) Needed as long as oil is needed. Could look at a late-game use extracting liquid antimatter from some other dimension
ImTech Solar Tower (optional build) Useful to keep around
Imtech Turbine (optional build) Useful power output
Gtech powered multiblocks (required builds) Stock Gtech keeps these useful throughout the game. Loss of large boilers are more efficient versions become available.
MM multiblocks Upgradable, fully recyclable
Railcraft (optional builds) tanks are useful boilers/turbines might become a loss after a long time rock crusher is disabled.
Single Blocks
Forestry Thermfab used to make few other components? Few more uses for E-tubes? Carpenter needed for woodworking/wood treatment
Gtech Steam machines can't be reasonably kept. LV/MV machines still find their uses later on.
Railcraft Rolling machine needed for thick/heavy plates, mixed ingots