If you don’t want the ac110 (which I give high praise to) I use a Fluval FX4 on my 125g (6ftx18inx2ft).
It’s a canister filter so it’s a little pricey and maintenance is something you’ll need to figure out a system for, Fluval provides a great pamphlet with the filter detailing how to empty the filter as well. It’s rated for up to 250g I believe and I only clean it once a month, I could wait longer I just enjoy the cleaning. Water is crystal clear and the filter is extremely reliable and has withstood multiple power failures. You said it’s your first year so it may be a little advanced but it’s probably my favorite piece of equipment. It will leave a lot of wiggle room if you upgrade tanks too, which we all do from time to time.
if you need more info I’ll answer any questions you have! Any video online will give it raving reviews.