The Marshmallows are a value favorite on Head-Fi. But I'd suggest a pair of Creative EP630's if you can get them before you leave (around $30 online ... anyone know where they can be purchased in a B&M store?). Those are two good "economy" canal phones. What's your budget? (The "Head-Fi Formula" would be to take that and increase it by at least 50 percent.
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If you can/want to spend more, you can get the
excellently isolating Etymotics ER6i's for under $80 online. (I consider the cost of mine to be part of each airline ticket -- and they pay for themselves after a few flights, cutting down on jet noise fatigue and blocking out chattering passengers, screaming babies, etc. Not a bassy, "fun" earphone on the ground, but I consider it a travel essential for its isolation and portability. But the Etys take getting used to ... you're leaving this earphone thing until shortly before you leave, so maybe simpler canal phones would be better in your situation (easy to adapt to). Just realize that not all in-ears isolate the same -- canal phones such as the Marshmallows and the Creatives don't block out as much sound as IEMs such as Etymotics, Shure, Westone, Ultimate Ears, Future Sonics, and so forth.)
Hey, you can go up to the $900 range on consumer IEMs ... but even the Marshmallows would be better than non-in-ear earbuds. Not only do earbuds fall out, they let in a lot of noise and you have to turn them up loud in loud environments, hurting your hearing and irritating the people sitting around you.
You're doing the right thing in upgrading from earbuds for airplane travel. Have a good trip.
