It would be better for HD quality to upload. People nowadays, like in the states have a fast internet connection and better computers. So i think 720p or 1080p is a resolution to upload.
However, I think you should consider using wmv because youtube supports only the following formats:
https://support.google.com/youtube/bin/static.py?hl=en&ts=2888402&page=ts.cs
Also because the bigger the file size, the more bandwith you need o upload it right?
And i'm not sure, but the rest of your options such as
AVCHD 1280x720 60p
AVCHD 1920x1080 60p
AVCHD 1920x1080
AVCHD 1920x1080p
HDTV 1080i 60i (For PC)
HDTV 720 60p (For PC)
look like they'll be in mkv or something with huge file sizes (mybe even gigs, because you are using 60 fps, though that may be dependent on the video length of video), and I'm not sure if those filetypes were meant for streaming. Usually, you want less size yet better quality so it easier to upload and stream.
so i think it better if you use WMV for 720p/1080p or try converting it to other formats and see if the quality is better or worse.
try converting between Webm, avi, and mp4 and see what you get.
also heres info on Webm if you want:
http://www.webmproject.org/
http://www.webmproject.org/about/
Good luck