To be honest I am not crazy about any of those monitors. I am not going to get all snooty and say you need a $4000 pair of Focal monitors. I know I could not afford that. I will say though for anything close to a flat response stay far away from the m-audio monitors.
I use a pair of Event TR5s, these are great little monitors with a rather acceptable response. These things pack some power too. I think there is only 35-50W to the woofer, but man they can kick out some serious amplitude. The TR5s have been discontinued, but I picked up my pair off ebay for something like $250 for the pair.
I really like Event, beyond that I would only look at Dynaudio, Genelec, and Focal, all three though come with one big ole' price point (although not bad considering the product).
I would like to add that from my experience the HS series is really good to reference what your mix will sound like in the club, but do not make very accurate monitors. If you ever were able to get a secondary set or a Mid-field set, that's when I would start looking into the Yamamhas.