Reply to Using KRK Rokit 8's for house parties?

Hey all I'm looking to upgrade my speakers and I'm looking at the KRK rokit 8 and the Yamaha MSR 100/250. I'm just wondering with just one KRK rokit would I be able to rock a house party? How would the bass response be? The main problem with my current speakers (Numark NMP5) is that they are 20W and have weak bass, would 90W be a big difference or should I go with something like the MSR 100's 100W or 250's 250W?