I absolutely hate Steinberg's reverbs. Metallic, ringy, harsh, eugh.
The only thing I use is the VST Dynamics channel (it has gate, compressor, saturation and limiter all in one plug). The reason being that the compressor in VST Dynamics is the only software compressor that I can get to easily "pump".
Ideal settings to get hardware VCA type compressors to "pump" would normally be a hard-knee, with very high ratio, average attack (say 20 to 40ms, to let the transients of the drums through to add punch), really fast release, and finally a low threshold (but high enough to allow the compression to return to 0 dynamic reduction on the tail end of the "pump"). Apart from the VST Dynamics plugin, most other software compressor don't seem to want to pump, why's that then?!
Again contrary to Khazul, I quite like the Mastering Edition multiband compressor. Seems to add a nice and immediate "processed" quality to stuff running through it. I use it in synchrony with the free Endorphin compressor by DigitalFishPhones, and they seem to work really well together. I only tend to use these on already mastered commercial tunes, though, to give them a "radio broadcast" feel (CD masters sound so sterile. I prefer to hype them up a bit.
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Magneto can be nice on various channels when mixing (i liked it on pads/strings), to give the tape-saturated effect.