Test your setup after adding 5 mods at a time. Or you would have fun time while searching, what mod breaks your modpack. Here is a simple list of mods that you can use (if you have a lot of time to dig through it (google notenoughmods)). Greg also has some recommendations on his downloads page. I might add to this post some fancy (yet useless) links, but this forum prevents me from doing this 
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