REL strata vs. storm and room size

I need some help. I have B&W sig 805's with a Trivista int amp, and I want to add a rel sw for 2 ch. music only, it will not be used for HT. My room is 18x20. Will the strata be the right size? or should i go with the larger storm. I'm not a fan of booming bass, but I would like to hear more of the lower end that I know I'm missing now and it seems that rel owners are very happy with their sw.
thanks.