I know it's an old thread but I can't let that one go through unanswered.....AKG have some great mics.
The D320 and D330 and the D3800 and D3700 are up there with the Senn. 421 and others..... The D690, 770, and 880 are easily as good if not better than the 57 & 58.
Also the C535 is great on...