Sorry Kristin - but your US TV will not work in Argentina - This because the TV signal in US (called NTSC) is incompatible with the signal in Argentina (called PAL) - Yes, there are TV receivers which are compatible with the 2 systems, or even the 3 world systems (NTSC-PAL-SECAM) but Americans in the USA never hear about these except in stores specializing in electronics for "export" - all voltages, all systems... Same problem will be with any video player from the US. There are "all voltage, all systems" video tape players/recorders as well. I bought my TV and video equipment in Miami. It is slightly less expensive than what you would pay in Buenos Aires. Tapes or DVD you buy in the US will not work in Argentina on regular equipment, and same problem for tapes or DVD you would buy in Argentina and would bring back to play in the US, unless again using special "all systems" equipment.
Have a look on Google and Wikipedia for "international tv signals and DVD standards" so you will get all the details.
By the way - no problem for "audio equipment", stereos etc...
Best regards -