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Look in analog devices web site, there are thousands useful documents. If you need modulator design, look IEEE transactions of Circuits, Measurement, and othere, I saw many perfect articles about design sigma-delta modulators.
With high-order you get increased noise shaping but more stability problems.
You have the choice between single-loop and cascaded (MASH) architecture.
Then you can also play on the choice between single-bit and multi-bit internal conversion. Multi-bit improves the stability and attenuates tones but you have to care about the feedback DAC design (using Dynamic element matching (DEM)) but that should not be a problem in modern deep-submicron technologies as you can put a lot of digital in small area.
About design, look for books of Schreier and his toolbox in Matlab .
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