I was lucky to be able to buy a few genuine Technics headshells when they were still only $20 each. It's very unfortunate that the price has gone up so much.
I also have, or had, a lot of different generic headshells. Quality ranges from great to awful.
As a general rule, I now avoid the classic "cheese grater" headshells, which look like this:
They seem tempting because they're very inexpensive and they're very lightweight, which is a feature we often need, but there are two reasons why I dislike them:
1) They are VERY resonant, which is bad, and outweighs any benefit you'd get from their reduced mass
2) Quality control is generally poor. Most of these headshells are now made in China, and it's very common for the azimuth to be slightly off, which results in your cartridge's diamond pointing slightly to one side instead of pointing straight down
I've also had the azimuth problem with several of these generic Technics-lookalike headshells, which are also made in China:
So I now avoid those too.
I have had good or great experiences with the following name-brand headshells, which all have worked well on my Technics turntables:
• Ortofon SH-4, available in several colors, $29
• Numark HS1, available in black or silver, discontinued but they show up on eBay and other sites occasionally, usually $20 or less
• Stanton H4S, available in silver or gunmetal gray, discontinued but they show up on eBay and other sites occasionally, usually $30 or less
• Audio-Technica HS10, available in silver or black, usually $40 or less
• Also worth considering is the new Pioneer PC-HS01 headshell, which I haven't tried yet, but it looks like it's probably at least as good as the Stanton. Usually $30 or less.