After playing the XL, it was VERY hard for me to go back to the original 3DS. The screens just feel so small and less immersive, so much so that I ended up just trading in my day-1 3DS for the XL, after transferring the ambassador games of course.
Also, as someone with over 100 DS games, backwards compatibility is something that is very important to me, so the 1:1 native mode on the XL looks much better than the original 3DS (and even the fit-to-screen looks pretty great).
You will hear a bunch of people who complain that DS games look "terrible, washed out, pixelated" on the 3DS, but it's mostly from people who only play Pokemon.
999, Phoenix Wright, Monster Tale, Advance Wars, Castlevania, Kirby, Zelda, Bowser's Inside Story, Solatorobo, Super Princess Peach...they all look great on the XL.
I know OT I guess, but I'm not sure if I should get an XL or an old Wii.
I'd save up for a Wii U since that's what all the new games are going to be for. Otherwise, I'd get the XL if you don't already have a normal 3DS. I think the XL is better than the ordinary 3DS by far. After owning a DSi XL, it was hard for me to go back to a smaller screen when the 3DS came out.
I feel so much more comfortable with the bigger screen. The control pad is also much more comfortable to use; my hand would cramp up after like 10 minutes from using the control pad. I have pretty small hands too, so that's saying something. It also doesn't hurt that the XL is only like $30 more than the 3DS, IIRC.
Wait I got it! Super Mario 3D Land will be in California and Super Mario 3D World will be in Florida. Zing! ~AloofGuyXXVII