Just thought a discussion on what mods people are mixing into FTB might be neat. 
Personally, using DW20 pack, added GT and some other bits from Mindcrack pack.
External from FTB, I have added:
Denoflion's Valve Pipes
Ars Magica
MineFactory Reloaded
Still debating ExtraBees and Thaumic Bees, though probably not while I wait for Ultimate and settling of Ars Magica joining or not. Not even looking at Mo' Creatures until Ultimate.
MineFactory Reloaded was a lucky hit in that the configs didn't need any changes, though Ars Magica has both some block ID and item ID conflicts with RP2 and TE. I opted for shifting AM block IDs to 1400 and up. Decided to change TE item IDs by +150 (only a few, where AM has tons) and seem to not have troubles now, at least that I've run into. I forget in regards to Valve Pipes if anything needed changing.
Knowing I may have to start a new world to utilize Ultimate properly isn't a big deal to me. So far, it's really fleshing out into a far more interesting package, albeit far more dangerous (AM mobs are...challenging). Though hunting several kilometers now searching for rubber trees I could actually utilize...
So what are other people adding on their own? Why did you add it? Whether it gets into FTB or not, what makes the experience feel more "complete" to you?
Personally, using DW20 pack, added GT and some other bits from Mindcrack pack.
External from FTB, I have added:
Denoflion's Valve Pipes
Ars Magica
MineFactory Reloaded
Still debating ExtraBees and Thaumic Bees, though probably not while I wait for Ultimate and settling of Ars Magica joining or not. Not even looking at Mo' Creatures until Ultimate.
MineFactory Reloaded was a lucky hit in that the configs didn't need any changes, though Ars Magica has both some block ID and item ID conflicts with RP2 and TE. I opted for shifting AM block IDs to 1400 and up. Decided to change TE item IDs by +150 (only a few, where AM has tons) and seem to not have troubles now, at least that I've run into. I forget in regards to Valve Pipes if anything needed changing.
Knowing I may have to start a new world to utilize Ultimate properly isn't a big deal to me. So far, it's really fleshing out into a far more interesting package, albeit far more dangerous (AM mobs are...challenging). Though hunting several kilometers now searching for rubber trees I could actually utilize...
So what are other people adding on their own? Why did you add it? Whether it gets into FTB or not, what makes the experience feel more "complete" to you?