Ive been eyeing a pair of the hs80m monitors myself. Yamaha made the NS-10 monitors which were used in major studios all over the world for years, and many are still in use.
As far as ported vs. unported, it's a personal choice. To my ear the ported monitors seem to reach down lower into the bass freq range, but the unported ones seem to present a "tighter" bass response. One thing that every studio monitor has in common is, they've all got a lie to tell.
Take a couple of your favorite CDs shopping with you and see what sounds the most accurate to your ear. Most of the monitors on the market in your price range will get the job done. There's a learning curve involved with any of them, you just have to spend some time mixing on them and taking your mixes out into the "real world" and see how they sound.
As far as yor room, hanging acoustic foam isn't necessarily the best way to treat it acoustically anyway. Diffusion is what you're looking for. A bookshelf full of books or something similar behind your mix position can work just fine and not look out of place in your living room at all.
Best of luck and please let me know if there's any way I can help. 
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