Thanks for the quick reply!
One more quick question if you don't mind. I also have a dreamcast I play occasionally, and on my old hdtv I could use a VGA cable with it to get a pretty good looking 480p. But on my new tv, it just says "no signal". I read online that it may be because it won't recognize the particular resolution even though it has the VGA input. Which sucks.
So, is the XRGB mini any help with dreamcast? How about N64, Ps1, and Ps2? If it will help all my old machines look nice on my hdtv, then it may be worth it. If it is only gonna be useful for my 8 and 16-bit consoles, I can't justify that.
Then I would need to decide whether to also get SCART cables where relevant. Kevin Larabee's video on the XRGB mini he just ran composite through it and it looked amazing. If I could get that image quality, I'd be stoked.