What kind of build are you thinking of? Depending on the size of tank and what you want to keep, we can give you suggestions on what's new and awesome for you to use! Lots have changed in the past 10 years. But it's pretty cool to know even more is coming soon.
The pretty big ones that apply to most reefers IMO are:
LEDs - Nano Reefs FINALLY have an option. You can pack so much light into these little diodes. We were limited to a 24" T5 or Power Compact fixture if you wanted something decent. Now you can grow even SPS in a nano tank with no issues, if you know what you're doing. Much slimmer profile and also have controllability. You can set timers and adjust power from your phone, so no more raising your lights and plugging them into outlet timers. The electricity and heat output is also considerably lower. No more changing bulbs either!
Biological Filtration - You can purchase media in the form of porous materials. You don't have to rely on the "lbs of live rock per gallon" rule as much anymore. These porous media do a very similar job, and have much more surface area than actual live rock.
Dry/ Man Made Rock - No more weird little critters and algae. You can now start your tank with man made or dry rock and take your time scaping things. Once you want to start your cycle, toss in some liquid products designed to add beneficial bacteria and you're off!
Temperature Controllers: You can set up an Apex if you want to spend the money, but you can purchase other temperature Controllers like an Inkbird for $30-$40. It takes in two plugs, one for a heater and one for a cooler. It will turn on/off your heater for you when out of your desired range. And it will kick on a cooling method (like a fan) when your tank gets too hot until it goes down to your desired temp. For the low cost and extremely easy set up (seriously took me less than 5 minutes), it's almost a must have for anyone in the Bay Area. They make an aquarium rated one, where the plastic probe is replaceable if it ever goes bad.
There are a lot of other cool toys and gadgets available now, but they're not a necessity and more of a luxury. I might be missing a few other things, but these would have changed how I set up a tank 10 years ago, and I'd recommend these to anyone starting a new reef.
Cheers,
Darwin