SG500 is universally loved.
If you’re exploring the retail landscape you might keep your eyes peeled for a Shapton Rockstar 500. If it’s any cheaper, grab that instead.
As others have noted, and Michelle Obama almost said, you can go high after you go low. I’d round out the 220, 500 range before going to 2K, 6K, 16K.
Many of us starting out had a fascination with finer grit stones, many believing that finer = sharper. We know now that is not exactly how it works. I worked my way up to a Suehiro 20K before working my way down to the very coarse grits.
Dabbling in some mid-grits is almost a prerequisite in the learning experience…. even if they don’t get used quite as much later. So for that, I say, go for it. Pursue your desires and get whatever stone is giving you an itch.