Yeah, for anything around 200ish and up the price difference for glass vs acrylic is nonexistent. You're looking at around $1600-$1800 and up for the tank alone. Custom stuff is more overbuilt than the big box stuff, which is adequate. Up to 150 gallon you can go 'big box.' You save on the package, but the stands aren't the best so over time you end up making one or ordering a heavy duty lifetime one.
I ordered my 225 glass through Custom Aquariums. Thought I'd save on the stand. So I purchased a different (wood) stand for $600 bucks. Well that sucker deflected, bowed and started to split after a year. So I bit the bullet and spent $1200 on an aluminum frame stand. It has no deflection, can't rust, and ain't going anywhere. Its so solid on the floor if I have overflow it just puddles around the bottom. And because its through the same company there's a lifetime warranty.
My 225 has a marine grade steel frame...I could dance on the sucker and not make a dent.
So realistically you're looking at around $2400, give or take a couple shills for a setup you won't have to repair or replace. Assuming its a basic setup without extra plumbing cuts.
My custom acrylic 125 was around $1900. If it were standard it would have been $1450. I had it designed to hold 125 for actual volume, not the 125 model size. It also had larger custom cuts up top for filtration and deco...something to keep in mind with acrylic with the 'closed' tops.
Quality stands for big acrylic can get pricey, like $1500-$3000. Look to spend up to $5,000+ if you have steel or aluminum tubing stand with cross bracing and a real big tank (like 350 gal and up). They'll hold anything but you'll pay. That's why I'm going with cinder block.