Hey,
I think that for his speaker choice, I would go with the cheapest one with all the features you need. The speakers do not need that much juice to drive. If you plan on upgrading the speakers in the future than go with the better one. Then again, by the time you want to upgrade, your reciever maybe obsolete.
Orbs may have great reviews but ask around this forum, and I think they can recommend you with a better system. Basically what I'm saying is that with their given size, don't expect too much for music. Of course, you may have different priorities, like aesthetics or your girlfriend/wife, then you have no choice.
I have a Sony HT-IS100 in my bedroom and they are enjoyable. It definately looks way better that sticking a few bookshelves in there.