Every surgical subspecialty has a website with a bunch of similar threads where people will ask "what are my chances" type questions, and if you dig enough you can at least get an idea of what type of applicants try to go into those specialties.
Specifically, there is a "Matched Applicant Statistics 2008" thread on plasticseducation.com where you can see relevant data on Step I/II, AOA, class rank, research, and med school from matched applicants--I think there's one from 2007 as well.
Similar websites (off the top of my head) include OrthoGate, UrologyMatch, and UncleHarvey (I think that's the NS one)--I bet ENT and ophtho have sites too. I'm not sure about general surgery but I can tell you that general surgery candidates run the gamut from average joes to the uber-competitive top-of-the heap types.
Something to remember if you're asking the "what are my chances for Competitive Field X" question is that the Match is a fickle beast. You can't control a program's rank list or even whether they choose to offer you an interview--all you can do is try to make yourself the strongest applicant possible, play the percentages, and try to find a good fit. I have personally seen excellent applicants (with great scores/LOR's/AOA/research) fail to match in plastics after going on 15 interviews, while other seemingly less qualified applicants get spots.
I remember talking to the plastics PD at Wake Forest and she told me (this lady is a badass by the way) a story: she had her heart set on a particular residency program, was told by the residents/PD that they wanted her, ranked it #1, and then matched at a different program (her "backup" program was UMichigan--reflects the type of applicant she was!).
The moral of the story is that you can be the best applicant in the world and still fall through a program's rank list--the converse, which is just as true, is that you might have a weaker app than someone else but really click with a program and match there. So rather than asking "what are my chances", I recommend asking yourself "is this the only thing I can do with the rest of my life?" If the answer is yes, then go for it--balls out, all the way! You'll land on your feet somewhere if you have the passion, determination, and dedication, regardless of your chosen field.