Jason did my first toploader mod, a Composite mod as well as "stereo" out with a switch, years ago. Reason for the switch on the pseudo-stereo is that supposedly certain games don't sound right with it enabled, but I honestly have never run into a game that didn't. It's an awesome mod, the solder work is nice, no huge blobs of hot glue like some NES modders out there. The absolute only complaint I have with that one -- and it is extremely nit-picky is that the 3 RCA jacks on the back are ever so slightly not level.
I have since acquired, secondhand, a Component modded toploader, with "stereo" out and a power led, also done by Jason. This one I bought secondhand, but I was confident buying it because I know his work is solid. This one has 3 RCA jacks for YPbPr (perfectly level) and a TRRS plug where the RF used to be for the "stereo" out. No stereo switch, because the CH3/4 switch has been repurposed to change the pallete instead.
I'm debating eventually getting an HDMI mod for a third toploader when it's finally finished, because NES is my baby and sometimes I have more money than sense. If I do it, I will go through him again with no hesitation.
I for one will take Component/HDMI over RGB any day. The people who say they can see a difference between the two, well... more power to them, but I think it's a placebo effect. Everything I've read seems to come down to "The difference, if it exists, is so minor that the overwhelming majority of human eyes will not be able to tell the difference" and when I've seen RGB side by side with YPbPr, I personally cannot tell a difference as long as the YPbPr/HDMI is on a high quality TV. The only RGB capable TVs you're likely to see in the US are PVMs and the like, which are typically small and/or pricey.
One thing to note though: If you do decide to put an NES on a HDTV, you're going to have to get used to seeing the overscan all the time. It's a little jarring at first, but eventually you get used to it.
