I couldn't find a link to any stats so I did my own. The file can be found
here. Make of it what you want but I found that 1'st round picks are all that great.
Notes:
1. The spreadsheet has multiple tabs and was done with excel.
2. A Pro-bowl player is only counted once even if they make the pro-bowl multiple times. My take is that an early round draftee either makes it to the pro-bowl or he doesn't.