I said I would buy them all and I definitely would love to get them all, but in these times I have to be realistic...
I'm pretty sure I'll buy Silk Spectre II, she just looks beautiful.
I voted for:
Nite Owl II (My favorite Watchmen character, would go great with SS II if the unfortunate situation might occur that I can only buy two...)
The Comedian (Looks awesome, could be loaded with weapons, headsculpts etc.)
Rorschach (Awesome character, looks great, possibility of different headsculpts, some weapons)
Dr. Manhattan was an awesome character, but I'd have to skip him. Looking at the possibilities for accessories and clothing, there aren't many options right now.
Hopefully my situation changes and I can still get him. (If they make him
)
Ozymandias is my least favorite, both visually as well as character-wise, so it wouldn't be a very tough choice not to buy him.