With $6000.00 I am not sure what direction I would go.
Could go custom tank but the wait time can be ridiculous.
The Red Sea systems are real nice for first time hobbyists in my opinion. Great for the advanced also but thinking from a starting point in hobby.
IM SR-120 are a cool tank.
Either way I say OP should take a month, put together prices lists and equipment, get ther R@R opinions which we have tons of and start things right.
Don't rush in this hobby it is your quickest way to death and depression