This is my first post here.

I was seeking tech info about Naomi systems and fortunately, I found this website/community. I'm looking to lay my hands on a full Naomi II system with VF4:FT. There is a seasonal sale going on at Coinop Express and they offer a used kit for USD550 (Please note that I never bought any arcade system before so I have absolute zero experience with that kind of transactions). Here is a list of the included parts:
Naomi 2 mother board
GD Driver
GD Software
Dimm Board
IO board
Control Panel (2)
cables
Manual
I quickly browsed this forum and found various threads where people were telling their bad experience with this distributor. I also learned about ECL of which everybody said only good things. I just wanted to know if this deal looks reasonable considering the risk at stake. I'd rather not throw out 550 hard-earned bucks only to collect garbage can at the post office. This already happened to me in the past (even though I'm careful) and let me say that this kind of experience is frustrating.
Also, I'd like to know which additional parts I'd need in order to have a ready-to-run system. There is this note on the listing page:
"If you buy the Asian Kit, we will have a special offer for 3.3V power supply, amplifier and jamma harness at USD50.00/PC"
It isn't clear wether $50 is for all the listed parts or if each part is individually sold for 50$. Also, is there anything else missing? Additional PSUs, cables, etc?
Thank you very much and best regards,
PM