I'm currently sitting 1800 LS : DS 1550, and I have some hopefully constructive thoughts for you.
Light Side smuggler is, to be honest, boring when stacked up with your Dark Side options. The DS choices and dialogue are much more fun, IMO, and I'm someone who ALWAYS chose Light Side in KOTOR. But I'm also role-playing slightly, which guides many of my decisions; my smuggler looks out for him and his, and if you cross him, well, gg. But he doesn't slaughter innocents.
I don't want to spoil anything, but Dark Side choices don't often line up with the values of some of your companions. I've taken a number of negative affection hits for my Dark Side choices, and while these points can be won back it does slow down the affection process. So keep that in mind.
I will say I get a sweet sense of satisfaction when I'm in a group of 4 players in a flashpoint dialogue and the other 3 choose the Light Side option and I choose Dark Side and win the roll. Generally the other players say "Oh man, thanks! I've always wondered what would happen if I chose that option but I don't want to tarnish my perfect light side score omg."
Also never choose a Dark Side option simply for bribe money, even on Nar Shaddaa it's nothing more than a couple hundred credits. Pretty lame.
Hope