You do realize later models of Wii lost real Gamecube support right? So you wouldn't have that on those either. Only the original model Wiis have true Gamecube support with memory cards and proper Gamecube controller ports.
Sigh...
Maybe you didn't catch it, but I explicitly said "fully featured Wii" up there. As in, all the functionality of the original model. I wasn't trying to recommend a Family Edition. I don't know why would I even recommend that when the GC compatibility is an important part for the person asking.
Nintendo still produced Wii's with all the good stuff during late 2010, with bundles such as Red Wii + NSMB Wii or Black Wii with Mario Kart Wii; that's when I got mine, so I know. And those models produced at that date, are by far the best version of the original console.
You don't have the disc reading errors with double layer DVDs that the original models (as in, produced first) had, and as I said, you also get a system that maintains itself cooler and takes less power. You even have better chances of getting a system with less use, which is convenient when buying second hand electronics.
...thats why, am looking and trying to decide what to get
, could go get a wii, then later on get also a wiiU; would anyone recommed doing this? (though it could get pricey)
I understand that can be a pain to choose. As I said, think of what you're going to do, or want to do the most.
Do you value Wii U's library more? Maybe choose a U.
Do you value more Wii/GC stuff? You're better off with a Wii.
You could start with a Wii, which is cheap, will give you access of hundreds upon hundreds of good games, and any accessory or game you get for it (besides GC stuff) will work with the Wii U, so if for some reason you end up wanting one later on, or find one at a good price you already have them, and you'd have spent time playing games instead of doing nothing waiting for a good offer.
Personally, I've lost my interest on a Wii U, seeing how most of the important games on it are being ported to Switch. Even Tokio Mirage Sessions is going there.
If you go look for a Wii, by the way, just like Ryccardo says, pay attention to the orientation of the Wii logo. If the logo is to be read with the console standing vertically, it is a Wii with GC support. If it's horizontal, it's a Family Edition and it had its GC inputs taken out. Don't get those!
If you go for a Wii U, I'd like to warn you to check that the gamepad is working well and its battery hasn't been worn out; because that's a pretty frustrating point of that system, and good battery replacements are getting rare and expensive.