Simply interpreting the stats according to last years match for plastics on the nrmp website:
For those who scored between 251-260 on Step 1 17 of the 18 applicants in that range matched indicating two things- 1) a 251 is not average of the matched applicants as there were about 60 others below that range who matched. 2) If you have between a 251 and 260 on step 1 you have about a 95% chance of matching.
Sorry if I am way off as I am very tired right now.....
The statistics referred to by the previous poster are for the 2007 main residency match and are available at
http://www.nrmp.org/data/chartingoutcomes2007.pdf . The statistical breakdown for the 2008 main residency match has not been made available yet.
As an aside, basing your chances on the match results from just one year is misleading. For example, in 2006 the mean Step I score was 231 and it jumped to 241 in 2007. Also, there were 6 unmatched applicants with Step I scores between 250 and 260 in 2006, versus only one in 2007. Making a judgement of probability based solely on numbers from one match cycle is not sound.
When I stated the the OP's statistics were average, I did not mean that they were literally the mean or median statistics for matched applicants (in fact, I'm not sure how this would apply to a yes-no variable like AOA). Rather, I meant that those statistics are neither exceptional nor prohibitive. Based on what I know about applicants who matched in 2008, which I grant does not include all 92 matched applicants, the OP's numbers fall somewhere in the middle of the pack--not ridiculous, like 280/bunch of plastics pubs/top 40 med school, and not lower-end, like 230/no pubs/random med school.
The median USMLE Step I score for matched applicants in 2007 was 243, whereas the mean was 241--this means that the distribution is positively skewed, and there were more scores at the higher end of the spectrum than would be expected in a normal distribution. Step I scores in the upper end of the spectrum have been increasing yearly, and I believe that for 2008 the median score for matched applicants will be high 240's--there is no reason to think that the trend will not continue, leading to a median score for matched applicants in 2009 of close to 250.
So, to clarify for the OP: I'm certainly not trying to discourage you. With the given academic profile, if you get good LOR's, have good extracurriculars, perform well on away rotations, and interview well, then you have a good chance at matching in plastics. You should just be aware that numbers alone do not guarantee anything. I was quite serious when I said that I have seen applicants with better numbers fail to match, and I have seen applicants with much lower scores get spots. The Match is a fickle beast.