Reply to Speaker Opinions (Yamaha vs QSC)

I have been starting to look into getting a pair of active PA speakers to use at home instead of my stereo and for using at small house parties (usually under 50 people).

Earlier this week I dropped into my local music shop to chat with the guys there about their opinions and it was recommended that I spend the extra cash to go with something high end from the beginning. Unfortunately they're a small shop and don't have a huge selection so I can't try anything before ordering it in.

The two systems they were suggesting were the QSC K series, and the Yamaha DSR series because of their build quality and warmth of sound.

I don't have the money right now to be buying a sub to go with them, and am not sure if I even need one for my intended use.

What I'm wondering is if anybody has any opinion on which brand to go with, and if you believe something like the k12 from QSC would put out enough low end to be a good listening experience. Most reviews I have found have either been by people using them for bands, or DJs that also were using a sub as well.

I am open to other ideas as well, but would like to keep things under $2000 (canadian) to start out with.