From what I see, you’re just planning on a purchase once in a blue moon right? So you’ve gotta choose things that you can maintain yourself. Assuming there’s a hardware store near you, this isn’t as hard as it sounds.
First off, for what it’s worth, I like ten balls the best. KK bearings reduce your response, and don’t do that much for time, it just keeps the string away from the sides- better for beginners.
On the self maintenance part, that basically boils down to bearing, string, and response. Bearing is the cleaning of the bearing- a bottle of YYJ thin lube will last you a long time. (For me, 3 years and I’m halfway through) If not, you can use trumpet valve oil as a substitute.
Response, you can either choose flow groove or pads. Pads, you’ll have to make your own (Silicone [plumber’s goop] on double sided tape, mush it flat, cut it out. Then, you can stick it into the yoyo itself. Getting correct response would be tricky though.) Or, you can use flow groove, and just pour silicone into it from time to time. (Window/Bathtub silicone, or Red RTV)
String, you can either buy a huge pack and hope it lasts, or you can make it yourself. I find it better to make it myself, because then you can spin your own preferences. Many tutorials, I made one, just use the search bar. This will require a drill, nails, wood, and sewing thread.
If you still need help, I’ll be watching this thread. And if you need a suggestion, I say learn to bind, grab a starlight/protostar/northstar, or a YYJ Bi-Metal, with the Dark Magic and the Hitman on the top of that list. Or, for something cheaper, a legacy, kickside, lyn fury will get you far too.