Andronikos is pretty cool and fits well with my SI, but Torian is by far my favorite. He's sweet and...well, he's just awesome lol.
At first I was so looking forward to romancing Corso because I got him before lvl 10, but so help me I wish my smuggler could slap him, and I stopped trying to romance him. He acts like my smuggler is some damsel or something and he is far too naive to be cute. Not to mention his stereotype-like nature towards women is just insulting. Shoot, I like the sleaze-ball known as Doc more than I like him. At least Doc doesn't compare the JK to a Hutts dancer.
Quinn... yeah, I loved him until he betrayed me.
Top favorites: Torian > Andronikos
Least favorites: Quinn > Doc > Corso (yep, the farm boy is my absolute least favorite)