Wilson
Foles
Warner
Brad Johnson
Grossman
Kapernick
Well technically Warner came more than 20 years ago for SB but I do believe that he might be the only undrafted winning SB QB
And most of those QBs on that list were carried by a much better D, not sure about Trent Dilfer; do not remember where he was drafted.
Wilson had the Legion of Boom; Foles had a very good D; Warner now there was a QB. Johnson had that great Bucs D. But as Grossman and Kapernick showed you do need to perform at a reasonable level to win it all.
Wilson and warner were the only two that made it to more than One SB. The rest were pretty much flukes.
Some of them made great stories to an extent; but no long term success.
Bottom line is that with some rare exceptions like Brady and Warner, you are not going to get an elite QB after the first rd.