I've played both the Martin DRSGT and Martin DM in guitar shops a while back. To be honest, I couldn't tell the difference between them acoustically. They both looked nice and played nice, especially for the price. As far as construction goes, I can't remember what type of wood they were made of, other than both having a spruce top. In any case, it's like Rumble Walrus said, you have "an excellent dilemma" on your hands. However, I'm not sure whether Martin still makes those models. Where did you find them?

I learned fingerpicking on a nylon string classical guitar. You can get a really decent one for the price of the Martins your looking at. The nylon string is great for beginners because the strings are softer and strung at a lower tension, and therefore easier on the fingers of one who hasn't yet built up tough fretting finger calluses. They're also easier to pluck. The only drawback to that is that it will take some getting used to if and when you switch to a steel string guitar.

Nicolai