First of all, if you're looking for an above-average salary, Wall Street is definitely the place to be. The real problem is that you will need to live near a major financial center (New York, etc.) to find work.
I know nothing about trading, but it seems like sitting in front of an array of 10+ monitors for hours at a time might be a good job for an Aspie.
I went to work at broker-deal as a junior sell-side research analyst a few years ago. I was brought in by a former executive that I used to work with who realized that my "special skill" would be useful in picking stocks.
When I first started the brokers (mostly frat-boy types in their mid 20's) quickly gave me the nickname "Rain Man", not necessarily in a good way. This led to some very uncomfortable moments for me where I was sitting in front of 30 guys during the morning call pitching a stock with many of them whispering and giggling while I spoke. I just ignored it and kept going.
But the fact is that I am very good at what I do (I am useless otherwise), my stock picks worked, and most importantly the institutional funds we sold to really liked my work and wanted to consult me on my companies. This meant $ for the brokers so they learned to accept me.
After two years, the senior analyst moved to investment banking and I was promoted to replace him. I was recognized as a finalist in my sector in the 2009 Wall Street Journal "Best on the Street" awards. Which I am really proud of.
During this time, my pay more than doubled to the low $200's - the guy I replaced made $450, so I was actually underpaid. I don't say this to brag, but just to show you what an "average" WS salary looks like if you make it 'in'.
Unfortunately, I didn't survive last year's meltdown, a lot of analysts much better than I were let go too. Since there aren't a lot of broker-dealers where I live, and I didn't want to move, I went back to my original industry.
I just wanted to tell you about my experience to let you know that if you are very good at what you do, and are able to grow a really thick skin, a Aspie CAN be successful on Wall Street. Please note that I am 42 years old and I didn't get good overnight, so be patient and focus on getting good and with a little luck you have a decent shot at hitting your financial goal.
Hope this helps, and good luck!