I've had some revelations through my experimentation...
1) DeNoiser takes too much away from the original sound. When applied, there is not enough air around the instruments and vocals. Results are best when exclusively using the DeClicker (with a mild setting). DeNoiser is best left for tape hiss and FM issues. It's best to leave a little surface noise when transferring vinyl.
2) After going through the DeClicker, the SLIGHTEST amount of boost of high end from Spark's One Band EQ seems to really open the sound back up again. I used to stay away from EQ manipulation, but I'm quite pleased with the sound through my B&W speakers when tweaking the high end ever-so-gently...
3) I see why people love using a Limiter. I'm hooked! Again, another great Spark plugin (Native CL) is yielding outstanding results. I set it at -.01, find the hottest sections, and boost the input so it's only rarely hitting -.01, not needing to cut off too much. The dynamics are improved beyond belief!
4) DSP Qattro has an amazing setup for running all of these plugins WHILE recording! What a time saver! The only thing I have left to do after recording is dither down to 16-bits, create the playlist, and burn!!!
5) It's nice to know that former Spark programmers work on DSP Quattro, that the main programmer still loves those old plugins, and that the new ones that they're working on should be of similar quality!!!