Cool to be helping your folks!
My parents are looking at getting some stuff for their living room and are redoing it. All of the family is coming over to their house for Thanksgiving and they want to get the room all finished off. The room is 17x12x8ish but they will probably never have the sound blasting.
. . . . I don't know much about A/V receivers or speakers but I recommended that for now they only add a 2.1 system and add on later.
Good plan! However, depending on the level of your folks "techno-peasantry" (an endearing term I use for my folks

) you may want to
consider just getting a pair of active monitors to connect to the L/R audio outs (RCA plugs) on the TV vice a receiver/speakers set up.
The speakers I was looking at getting for them are the Behringer 2030p's . . . These should be adequate for their needs, no?
Yes. PM "Lsiberian" (or is it ISiberian ?) if you need more specifics, he seems to know a lot about these speakers.
. . . know if there was any difference between the reg studio monitors and the Ultra-Linear Reference Studio Monitors, I didn't know what to tell her(besides a $1 price difference). Is there a better place to buy these than Amazon?
No difference, one entry uses more marketing lingo than the other, a 2030P is a 2030P.
Google search "2030P price" for other online options, just make sure they check out feedback/are comfortable with other online retailers. Amazon is reliable and in my experience trustworthy, I would not want my folks to get burned by some sleaze outfit--not worth the "savings"
My mom was looking at the Denon AVR-590 receiver and I was wondering what you guys thought about it. Everything will be hooked up through HDMI if that makes any difference. If you have any other suggestions in a similar price range (not too much over $400) I'd be glad to hear them, refurb or not doesn't really matter as long as she can get a warranty of some sort for it.
Denon is very good,
but their manuals suck and set up is more difficult than average.
If this would pose a problem for them consider
Yamaha. The "
SCENE" buttons found on their moderate priced models are very helpful to techno-peasant family members

. One button press turns the AVR on, sets the audio & video paths and the proper sound field (direct, neo-cinema, 2ch enhanced, etc.) --very cool!
As for a subwoofer I think they should wait until black friday/cyber monday (not as fun as it sounds) to look for one. But suggestions would be helpful.
Good idea! In your case, Mom Acceptability Factor (i.e. smaller sized/less intrusive) will probably be a large factor in picking a sub.
Cheers,
XEagleDriver