The Reed arm is intriguing to say the least and I would love to get to play with one. They look more expensive than 2K though. You never want to buy a used arm site unseen. They are too easy to damage. Just letting an arm sit out uncovered is enough to permanently screw up the bearings.
Reed is actually 5k EUR, but i bought mine from the manufacturer, it was their demo, the price was much lower. Some dealers can offer a demo with huge discount. It is impossible to damage Reed if it comes with original wooden box, the armtube is removed from the arm in original package. This is really a top class modern arm with unique design (so many unique features).
Chakster, 18 gms is up there. I use my Koetsu in an arm with an effective mass of 19 gms and the Koetsu is about as stiff as they get. 18 gms might be good for something like the Air Tight cartridges. Lyra’s and Clearaudio’s would get into trouble. The Ortofon Anna Diamond would work nicely.
Yes, even 18g is not the heaviest, i have Fidelity-Research 64s with 35g effective mass. I have more fun with vintage tonearms. I’m gonna try Reed 3p with Miyajima Kansui. Reed was nice with many cartridges i’ve tried before, but none of those carts are super low compliance, it was fine for medium compliance i’ve tried before.