Section 2 of my owner's manual for our 2004 SR 420 DA has all of the dimensions. I believe these manuals are available for most years and models from the Sea Ray site
Both actually. Depending on how you use the boat and how many people will stay on it, either is a fine boat. Those years it would be a 410 and 460 as the 420 started in 2003. If you are going to have adult guests stay over the 460 has a much roomier guest stateroom.