Not sure about the waves renaissance stuff, I think the effect is more psychosomatic than real. I`ve never really noticed that much effect with them, but I tend to stay away from waves gear anyway.

Crysonic NXtasy is a fantastic product for adding tube like warmth/Harmonic Distortion to sound.

With that problem taken out of the way you can then focus on using good compression applicable to the job.
There are quite a few nice compressors out there all with their own quirks and character.

I`m a huge fan of Liquid Mix stuff, and would recommend a Liquid Mix to anyone.
Sonalksis make a lovely compressor with some interesting and useful features and their dynamic EQ is simply amazing for mix tricks not possible with anything else. Their TBK3 extreme compressor is just madness. Very unique.

Stillwell stuff is also very good. The Rocket compressor is pretty nuts.

I find the Sonnox plugs to be good for EQ also.

"Warmth" is a subjective term, I find good use of EQ and use of sound will give more warmth than a "warmth" plugin.

If your mix is already warm from your sound treatment then the use of a valve type harmonic distortion in a very subtle way will be all you need just to add a touch of silk.

Creating space is all about EQ and sound placement within stereo.

EQ isn`t just the application of an effect to a sound though. The best EQ is choosing the right sound for the mix in the first place.