Yea that forum is very addicting, and it is actually turned into my favorite one. I spend most of my time over there.
I was previously 175 back in high school, stopped lifting and pretty much eating and dropped to where im at now, which is 148 (just put on another pound). I gained 4 lbs in 4 weeks which is great. You should really shoot for 1 lb every 2 weeks, but your gains will eventually slow. There is no doubt in my mind that i will put on the 15-20 lbs that i want to.
My current height is 5'10 and 148 lbs, but i dont look that small. Ive never been big on looking at my bodyfat % because i literally have the best you can get.
The 4 lbs i put on so far maybe clean, but the total 15-20 in the long run will not be, i just dont do it that way. I can cut down my bodyfat after i bulk up and look solid. Whenever you bulk you will put on some fat.
Definitely continue to read the forum there, i spend much time in the Nutrition section, supplement section, and weightlifting programs, and finally weightlifting journals. Its always good to see what others are doing.