I've got a chance to buy a new Premiere 4 at a very good price, and it has the 75 hr. drive, which I want, but is a TCD746500. I was under the impression that the 750500 had the bigger drive while the 746500 had the 45 hr. drive. The box does say "expanded edition" and "75 HD hours" so I assume I was mistaken. My question is- will I be missing out on any features of the 750500 by buying the expanded edition of the older model?