These cars are expensive to fix. I think it better to buy a used M3 with low miles and some time left on the warranty.
I also don't like the idea of buying the first production year of any car. However, this is not as much of a concern as it was for cars of the past.
I think the biggest difference between 2008 and 2013 is the software and that is easily upgraded for $150.
DCT is great. You would be missing out on something that makes this car special. Also competition package has way cooler rims and is 4/10 inches lower. Might as well get premium sound too
The longer you wait the cheaper it will be. Why not wait 2 months and buy as soon as you get your tax return?