Haha, my dad just left for Quebec, but alas he doesn't play with Tamagotchis so he wouldn't know.
Anyway, I recommend bringing a maximum of 3 tamagotchis, and have them all in the low-mid range neediness.
The v1-v4 are all good candidates as they're low maintenance.
The v6 is a fairly high maintenance Tama, and I don't think you'll want to spend too much effort on your tamagotchi.
The Tamago is really bulky and isn't really travel-efficient.
The lower versions will tend to get a bit boring, so I'd reccomend bringing only one.
IF YOU WANT ONE TAMA:
v3 or v4
IF YOU WANT TWO TAMAS:
v2, v4
IF YOU WANT THREE TAMAS:
v1, v3, v4
That's really all I'd say. Don't bring more than three because it'll be a hassle.