EOS 7D-Canon 100-400 F4.5-5.6L IS/ Sigma 18-200mm F3.5 OS/ EF50mm f1.8/ Speedlite 580EX2
i think the most impt direction in this hobby is to shoot more and be learn from the pics u get.
If the pics arent up to standard, (in your case ..birding [which i have no experience with, im into catting]) there are many other factors to consider before putting down hard earned money on super expensive lenses
the most important thing is enjoyment from the hobby. of course many ways of achieving that enjoyment