Yes, a good quality newer generation DLP will have a much better picture (subjective) then any LCD in a 32" and greater screen size. LCD is still great, but watch something like Star Wars between the two and you'd see DLP displays much------>much better blacks, and LCD ghosting of fast moving bright objects on a darker background (lightsaber fights) is very noticeable. Really depends on what you watch a lot. Sports and sitcoms, comedies, etc. either is fine, but if you watch a lot of sci-fi, horror movies and such, then I'd go DLP if possible.
DLP's main flaw is you will be changing the bulb after a few to several years for about $200. Also, once SED replaces everything for several years, finding replacement bulbs for DLP might become tough.
Size wise, if 37" is pretty much the limits for your dorm, then your looking at LCD for now. Though if you can go bigger, a 37" LCD does not take up very much more physical space over a samsung 46" DLP, some of the difference is in the height of the unit.
Noise wise, DLP itself is quiet but the sound on the samsung is better then standard sound you'll find on a LCD set. It is higher wattage and similated surround, meaning it sounds better louder and you'll probably be more tempted to watch TV louder. Of course, just about any 3rd party sound system will sound much better than samsungs.
As far as refurbed goes, as long as there is a return policy, your usually ok. I actually prefer refurbed products since they are tested to be in working order unlike new products coming right off the assembly line. I always try and buy refurbed tech when I can if the savings is more then 40%. Of course, as with anything else, there is always some amount of risk of a lemon.
Most importantly, you need to go to several stores and look at different screens in person and see what you like, even if all the feeds are only coming off a optimized HD feed. Some people see unbearable rainbow effect with DLP (less then 5% of people), while most don't notice it, some people can't take the brightness or the ghosting of LCD screens. Every review and opinion you see on forums are subjective and for every pro, someone else has a con.