Paradigm Monitor 5v2 - Studio 40 v3 - worth it?

I'm planning to upgrade my Monitor 5 V2 with premiere S-series stands & NAD c320BEE int. amp within the coming weeks, I am thinking of just making a step up the ladder to the studio 40s with a higher end NAD int amp also (c352/372).

Anyways, I am wondering what you guys think about the studio 40 v3s vs the monitor 5 v2s? Is the price difference worth it? And what do you recommend for amplification for a room about 15x20 in size.