Originally Posted by nova0002
I strongly disagree. You don't have to drop $1000 + for a noticeable difference. From personal experience. I went from an Onkyo SR605 (with dated Faroudja) to a Denon AVR591 with no vid processing @ all. And I noticed a noticeable difference in the picture. And thats with an old receiver with old tech. That's not theory, or guess that's my personal experience. It should be noted I don't have a brand new expensive plasma (older Pioneer plasma), but all my sources are HD and everything is connected via HDMI. Faroudja > No vid processing chip...from my experience. Not trying to argue or disrespect, like I said this is my personal experience. Yes I'd recommend the Onkyo, if you can afford it I'd go with the Denon 891 (you can find it online for $450ish shipped, I've seen it on amazon for that much, or the 791 which is $400ish shipped give or take). If thats not in your price range go for the $300 onkyo with Faroudja. I'd save up and spend a lil more and know that you wont regret your decision in the future. I went cheap with the 591 (well not cheap but uninformed I should say) and am now trying to sell it to upgrade to one with a video processing chip again.
Even with the best receiver VP (at the time,) with my Z7, I noticed little to no difference with receiver VP.
However, some TVs may not worse scalers than my TV. But you would have to ensure that your TV was not re-scaling the input, as can happen (see overscan.)
As you say, it may depend. Like you say, I also, can only speak from my own experience.
I believe much of what I said does NOT apply to the OP, who apparently needs analog to digital conversion, not VP. I believe that does differ in quality. I know some people, had issues with conversion from their Wii for example (could have been user error, hard to say.)