For starters, go with a 360 S or E. E is the most modern hardware, while S has more USB ports and cooler design. Avoid the older white models and even the elite ones of the old ones at all cost due to imminent hardware failure.
Watch out for duplicate 360 controllers bought new. They are rife, and even amazon sells fake ones that look like the real boxed thing. Check my instagram (my username ResidentDante) for a pic of one fake 360 controller.
A lot of DLC is getting delisted, real fast. PGR4 for instance has it’s DLC removed etc. If you own old DLC, then you’ll need to traverse a terrible long list of dnowloaded stuff on your 360 (these will not be downloadable anywhere else). From this list you can download delisted stuff that you have purchased earlier, game trails will NOT make you access delisted software to purchase. The list is slow and full of crap like trailers, demoes etc. be patient!
Hitting Y (I believe) when highlighting the game you have put in the DVD drive to start, will give you an option screen, from here you can install the game, making some games load faster. An external HDD may be the way to go if you run out of space. Alternatively a large USB pen at the back.
Hydro Thunder Hurricane? Do you have it on XB1? It’s runs in the Low 40fps mark on 360, 50s on XB1 and rock solid 60 on XB1X (plus the lovely 16xAF does wonder with the water surface far into the distance).
Extra tip: You can get VGA out cables and a SCART cable that supports RGB out. The latter is kinda cool if you want to play old games ona CRT that support 4:3 and that originally were made for CRT consoles. Castlevania SOTN, Crazy Taxi etc. Sadly Sega ports like Daytona USA, VF2 etc. are forced 16:9 with a 4:3 square inside, on SCART out.