ReMix's newest patch is accurate as of May 17, I believe. It was released before the Draft took place, so you don't have Durant or Oden yet. But it does include all the players Live 07 has (Bargnani, Gibson), and the trades that took place during the 06/07 season are also reflected in the patch.
To install this patch, go here:
http://www.nbaliveforums.com/ftopic49417.php
and follow the instructions by ReMix to install the patch. Download
both the "sgsm and roster" file
and the roster fix (scroll down a bit to find it), otherwise your dynasty will crash when you play it.
Make sure to follow the instructions, and make sure to download both files.
Good luck,
Reaver.
EDIT: If you want the newer players, wait a around a week or so and Andrew will release his 07 roster patch.