Well, a stock A4 is cheaper, and possibly not as good, BUT
For the same price as a new Dm4 you could get a predatore'd A4, which in my opinion is the very best gun setup possible because...
A predatore'd A4 is smaller/lighter, more comfortable (though the 90* grip is pure preferance), has better eyes, and especially with the warranty from the guys at TAG, more reliable.
WA War Eagles PB
ANGEL 4 life