I discussed this quickly in class last week, but you will need to buy good headphones, not only for 290, but for 310 and beyond. You should not use earbuds as they are generally not very good, especially for excluding outside noise.
The official sound department recommendable is the Sony MDR-7506, but they generally sell at about the $100 mark (the price has gone up over the last three years).
The 7506 was introduced as a replacement for the Sony MDR-V600 headphones, which were actually BETTER headphones (they are better at blocking out external noise). I found an Amazon link that is still selling the Sony MDR-V600 at only $70!
Here it is:
Amazon Sony MDR-V600 Link
ALSO! Don't forget the COMPOSER-DIRECTOR MEETING