All of them...
They are all nice designs..but I do have to say....I love the Coeur de Leon. That is one awesome looking ship! That is the kind of Federation starship I would want to command. One that suggested that if you trifle with this ship and her crew, you could be very, very, very sorry! I can only imagine the firepower she would carry, not to mention of course its scientific and exploratory capabilities.
"We come in peace. Shoot to kill, men!"
I know I am not the Roddenberry-Utopia-spewing Dogmatic Trek fan, (LOL! DS9 my fave series, and NEMESIS my fave TNG film) but I am a Trek fan nonetheless....and to me, this ship would fit awesomely in the Trek universe...canon or otherwise. Let the Federation's enemies beware....Starfleet is back..and with a VENGEANCE!
Respectfully,
General Chang
"So the Enterprise is on her maiden voyage, eh? Now that is one well endowed lady. Ah'd like to get mah hands on her ample nacelles, if ye'll pardon the bit o' engineerin' parlance." -Scotty, STAR TREK, 2009