I say get the switch. I got one last Christmas and I love it. The game selection is really incredible for an ultra-portable console. If you pull the trigger, the only must-have accessories are:
· Tempered Glass Screen Protector (https://www.amazon.com/amFilm-Tempered-Screen-Protector-Nintendo-Switch/dp/B01N3ASPNV/ref=sr_1_6?s=videogames&ie=UTF8&qid=1531419415&sr=1-6&keywords=switch+accessories)
· Largest SD card you can afford (this is what I got: https://www.amazon.com/gp/product/B06XWZWYVP/ref=oh_aui_detailpage_o02_s00?ie=UTF8&th=1)
From here, what accessories you need is greatly influenced by how you intend to play (handheld, docked, screen propped up + detach controller). For me, I thought that I would only play the console while docked, so I got a Pro Controller first. In practice, I probably spend 90% of my playtime using the Switch in handheld mode and 10% of the time docked. I have yet to use the Switch with it propped-up and the controller detached (I just find it more comfortable to just play it in handheld mode). I’ve also learned that some games I prefer playing in different ways.
For example, I played Mario Odyssey 90% of the time docked with a Pro Controller, and 10% handheld. It was a lot easier to chain together the controller inputs with the pro controller, and using the “motion” controls with the pro controller was a lot safer than trying to do that with the Switch in your hand. Conversely, I am currently going through Zelda BOTW and I play that almost 100% in handheld mode, because I find aiming my bow shots easier that way (gyro controls+ screen being in your hand makes it real easy to line up shots to where it “almost” feels like I’m using a mouse).
So I would just go ahead and buy a Switch and play with it in a bunch of different ways before your trip, and then go from there. If you have any other questions just let me know!