Joel makes an excellent point here. Alot of what I do is based on who will be dealing with it later and what exactly I am recording. My only real rule of thumb is that I almost never heavily EQ something during tracking unless it is for a specific effect. Needing too much EQ is usually a sign that either the source signal, the mic, the placement, or even the preamp needs to change instead. Personally, having worked in my room so much with my equipment so much, I trust my judgement, and so do my clients. If I want to nail a track with some compression, then I do it. Rarely do I ever hit something too hard though unless there are other mics out simulataneously that would leave me some mixdown options. However, it is also important to not that 15 db of compression sounds very different coming from a Distressor or a DBX 165 than it does coming from a DBX 166, an RNC, or some presonus or behringer compressor. That is one of the reasons that people spend a lot of money on compression. You can generally use a lot more of it and hit it harder without losing the musicality of the tracks you are recording. Basically, they contribute to the sound you are after rather than just "treating" the sound.