Sony Drx-810UL or Drx-820ul

Does the older 810ul have any advantage over the newer 820ul. The 810ul is getting rarer and is sold out at most places. I know the 810ul can be flashed to the 1640, and has been out longer which is a plus. Ive read the review from cdfreaks or somewhere, and i remember reading that some disc that could burn at 16x on other players would only burn at 12x.

I dont really need dvd ram, as i dont plan on buying a dvd recorder, as i deal with HD, so im thinking the 810ul may be a better choice.

Yes, as a 1640 you can use qsuite test pack.