I hope you have used Amgia Forever to test out the Amiga scene before going for the real hardware. Sometimes, an affordable Amiga will sneak through the auction sites but all the interesting add-ons can become very expensive. Find out that you will like Amiga a lot before really opening the wallet.
Plus one to this. A few years ago a chance at a free (if in need of TLC) Amiga 1000 crossed my path and I took it because I never had a chance to play with one much back in the 80's. (They were never that popular in the US, there was this one mom-and-pop computer shop in town that carried them and of course the demos looked cool, but, nope, ended up firmly in the PC wagon.) I spent the time to get it running, mucked with it for a while, and... I'm uncomfortable using the phrase "never meet your heroes" because I never exactly idolized them (and in fact I've actually been making fairly mean sport of Amiga die-hards since the late 90's because of just how delusional they were getting in that twilight era where they kept trying to use them as "real computers" and insisting they could somehow still outperform Pentium IIs at... something), but it does sum it up, honestly. Maybe I'll go with "you had to be there". There's a lot of neat ideas, the hardware was way ahead of its time... but its time was 1985.
(I mean, I think I get it, if I *had* had one when they were new I'm sure it would have been a huge nostalgia blast, but as an outsider I found myself judging it a lot more harshly. The multitasking OS is technically neat but the GUI is butt ugly, interlaced mode at 15khz gives me a huge headache, the games I had to try are "fine", but honestly I didn't think most of them played any better than Atari 800 games (which is no doubt deeply unfair because I *did* have an Atari 800 and harbor a *huge* level of nostalgia for that)... I dunno, it just kind of all comes out "meh". A couple years after the Amiga I ended up getting a Tandy 1000-family computer and I love the beejeezus out of that, but, again, I also have first hand nostalgia for DOS that I don't have for the Amiga so it's a lot easier for me to forgive the clunky-ugly-lousy parts of the experience.)
So yeah, at least try before you buy.
I own a 500, a 2000 and a 3000 and they've been left to rot in storage because even 16 years ago the community was not welcoming to the new and the inexperienced who wasn't interested in immediately buying upgrades and parts, so my suggestion is simply do not engage with them.
And yes, this, really. It seems like to be a *true* Amiga user it's not enough to be interested in experiencing what the machine is actually capable on its own terms, it's all about pushing the thing way beyond its limits with objectively stupid upgrades.