I have an Aqueon 400 canister, HOTB skimmer and it was incredibly easy to maintain. on a 55gallon (48"x 12 x 20). This model of the canister is rated at 150g, which is why I opted for that. I wanted an over-powered filtration system to negate nutrient and water parameter spikes/issues, and it also drastically increased my bio-load capabilities (could handle more livestock). As said above, Don't skimp out on Lights ever.. I did and now I've got 2 LED strip lights that I regret. But Do not skimp on filtration either. Nothing is worse than Battling water parameters and chemistry with dosing schedules and frequent Water changes.
If you like DIY, you could do something like my HOTB Cheato Fuge as well to help nutrient control:
HERE
The Biggest Sway for me to OPT for the 400* version of the canister was versatility for Flow on the Return...
It comes with:
1 Regular Jet Return
2 HOTB Water-Polisher (Like HOTB filters)
1 Spray Bar with attachments to make its length anywhere from 8"- 30" or so..
It comes with a " T " coupler for the return as well... So you get to choose any
2 of the above listed for your returns if you like to spread the flow around on the return.
I chose to " T " the jet and 1 of the HOTB Polishers. Then I used 2 nano power heads at either end of the tank and got great flow throughout the tank.
And if the "HOTB" plumbing bothers you, just paint the back side of the tank to block it out or use the Stick-on Backsplash Film.
Best of luck to you... A sump is not for beginners if you aren't buying 1 that is already set up and all-inclusive. This hobby requires a ton of experience and knowledge, of course at least 2 hours of R2R skimming as well. I am 4 months in, and have another couple of months to go before I take the dive and set up a sump. The canister works beautifully.
Best of luck and welcome to R2R!!