Personally, I use 僕(boku). A few weeks ago, I used 俺(ore), but then I thought that I should be more polite.
I say, use 僕(boku). 私(watashi/watakushi/washi) is usually used by preists, or men who are very polite(or, atleast they do in anime).
For 'you'? I use 君(kimi), and very rarely, 貴方(anata), and if I'm mad, or talking to my brother, I use お前(omae). If I'm REALLY ticked(like, "I'm about to beat the **** outta you!!"), I'll use 貴様(kisama).