genuine prusa kit is a good buy.
And there is a benefit to puttin together a GOOD kit.
It should work
and you'll have an idea how to fix or change things.
I - personally - would not recommend a dirt cheap machine for a first time user. Generally you need a good working machine to make parts for the cheap ones :-)
And the cheap one won't work, right away and will usually require modification.

So other things to look at, I'll skip the nes with small print volumes:
Qidi x pro - not the largest print volume, but a solid machine with great support and zero build required - also has dual extruders:https://www.amazon.com/Function-Extr...strial&sr=1-28

On the I3 front there are a LOT of crappy designs out there.
The sovol 2v01 is getting some good reviews and it looks klike they've actually thought about it: https://www.amazon.com/Sovol-Pre-Ass...ustrial&sr=1-1
Support is good. They're a small company and still care about their machines and customers.

This is also along similiar lines: https://www.amazon.com/ADIMLab-Assem...ateway&sr=8-20

Were you to thrwo another $300 at your max budget, we'd come into some serious machines :-)





There are some good machines around, that