AliExpress now has a lot of split keyboards. Many of them pre-built, or don't require soldering (just insert your switches in hot swap holes). With your budget you can order almost anything.
I think Corne is simplest option, looks and feels almost like traditional keyboard. I have similar right now.
My personal top option is Charybdis, I will move to it next year. But this is more than just keyboard, but also trackball. So doesn't fit into "first split" criteria (if you isn't brave enough)