Time for my latest Ultimate Seed:
Disclaimer: I have the Voxel mods turned off and Rei's Minimap turned on as well as Forge Lexicon set to Blacklist (due to TC3 aspects with ingots). Everything else is the base Ultimate mod pack and as such should have the same or similar world generation. All Coordinates are x, z.
Seed: -7443758477168039127 (with bonus chest for my play world - it does affect some spawning)
With this seed you spawn near 89, 238 which is in a forest near a swamp (that's near extreme hills) and a Mini Jungle. In the swamp at 4, 355 is a Witch's Hut. If you enter the Nether from the spawn point you end up within 300 meters of two separate nether fortresses, though you don't end up in an easily defensible position (my portal is one block from me porting into a lava ocean -_-).
In my current iteration I'm playing in there's a TC3 very close to the witch's hut and I managed to get a portal gun from an obelisk formation that had a wisp spawner underneath it. Since these are random there's no point in me putting their locations, but if you're lucky you'll get something similar. All in all it's a very good seed with a few caves and plenty of trees near the spawn point, as well as several villages within a 500m radius - the one I recommend visiting is at 504, 82 due to it being near a desert and in my test world having a blacksmith, librarian, butcher, TC3 trader and Mystcraft trader. There is also a quite diverse number of biomes within a 500-600 meter radius of the spawn point, as well as a fair amount of surface lava and plenty of caves.