I just can't get into EBXL anymore... I don't like how many totally new and completely different biomes it adds, rather than just refining existing ones. For what it's worth, progress on Better World Generation 4 is heading apace and ted80's got some amazing things in store; the current BWG3 Forge build seems to be bugged (Magic Launcher says it's incompatible but it will run fine if you manually install) and the BWG4 development builds aren't Forge compatible.
I'd also recommend
Primitive Mobs, which adds a variety of new mobs to the world, some hostile, some passive. Comes with a config file and I recommend you use it because some monsters (brain/pink slimes and traveling traders, especially) spawn WAY too much with default settings in flat areas like plains and deserts.