Re: How to get the "huge" "big" sound
all the fat should be done right before mastering process, it's not about "mastering" at all.
to get fat and wide sound you should use a lot of processing (distortion, modulations, maybe even make few layers with different processing pipelines) for each instrument, , and this mean a lot of rendering sounds into wave files (and also very good thing that you can cut and play with your sounds more better than if you use midi data for synth)
for mastering - maybe a bit of eq (but this mean that you don't do job on mixer, better to step back), maybe exciter, maybe stereo imager (but again this should be done in mixer), MB compressor (carefully) and Limiter. Many dudes just put only limiter on master and all other tasks they do in mixer for each instruments.