My qualifications for this opinion:
1) I own an A3D and a couple 8bitdo controllers for it
2) I own a Summercart64, and an old ED64 2.5
3) I own 2 real N64's with the expansion pak installed, 4 OEM controllers with good sticks, and also a translucent purple version of that Retro-Bit Tribute64 you just bought. (good controller, but stick action is waaaaay too light, no resistance compared to OEM)
And my advice, for now, is stick with a real N64 console. Find an OEM controller with a tight stick if possible. Get the Summercart and load it up. And either some cheap HDMI converter, or if you have a TV that accepts S-video get a third-party Nintendo style 'multi-out' cable that includes S-video. (cheap on Amazon) Don't mod the console for RGB or HDMI or anything like that, It's not worth it anymore.
If you come to love it, THEN get an A3D. It's awesome. But it isn't the real thing. It could be argued (correctly IMHO) that it's actually BETTER than the real thing, but it will never be the real thing.