While Jedi would seem like the "go-to" class when MMO Star Wars: The Old Republic launches, I'd like to make present you with an argument in favor of going for the Smuggler. While the game's Han Solo class won't have cool force powers, they will have a Wookiee.
Smugglers will have a constant companion in Bowdaar, a Wookiee gladiator who started his career in the arenas on the moon Nar Shaddaa, also known as the Smuggler’s Moon. It sounds like Bowdaar will work like a pet in Warcraft, for use as a tank or crowd control as the situation warrants.
Smugglers can either specialize in dual-wield Gunslinging becoming “master of the trick shot” and “first to dive for cover and willing to take advantage of every opportunity." There's also the stealth based Scoundrel who doesn’t have time for “politeness or a fair fight”, and tends to always shoot first and ask questions later.
Check out the official description for more details.
So, when The Old Republic finally launches, what class are you going to play?