Depends if you want to drop the $$$ on a new tank or want to go used and possibly have to put in work doing a reseal or something similar. There is a significant price difference in going with used but can possibly come with some downsides. I went used with my 150g that I upgraded to. There were downsides. But if I went new, I wouldn't have a 150g. The return (COR20) and skimmer (Skimz203) were practically brand new. I basically got decent deal on some reef gear and got a free tank and stand. I had to do work on the stand and tank that took about a week. Looking back it was still worth it.
A Waterbox 167 will run you 5k this includes the sump and stand as well but you need to provide all your own pumps, lights, skimmer, etc.
A Redsea setups for 192g or 210g range from 6k -9k. These are as close to "just add water" as you get.
If you have the ability to DIY and can build a stand properly, there are companies that you can get the glass box from. Fish Tanks Direct has a pretty decent selection. You could start there. Never dealt with them, so someone else can chime in on customer experience.
Hope that helps.
