I'm not the best at this stuff, but yeah you're better off building your own computer like you said. You're gunna need a pretty good CPU and graphics card for recording and rendering. Also you're probably not going to need a giant hard drive (Unless you use fraps, those files are huge)
1) Patterrz 2) youtube.com/user/Patterrz 3) I really love posting lets play and stuff but something different I do is take requests from subs and make Dragonball Raging Blast 2 fights to see who would win in a fight between the two characters, I really enjoy interacting with my viewers like that