Not much wisdom to share, as despite having all the books, I've never played a game
"Official" metal minis, however, can be found at
https://www.northstarfigures.com/list.php?&man=295&page=2, along with the plastic box sets. They are true 28, so plenty of other ranges work with them.
The minis are nice, but be aware that they have no slotta tabs or integral bases - it's bare feet all the way
If you're looking for small scale sf, 5 parsecs is worth a look as well. It's solo or cooperative and has a pretty small model count. There are several threads in this sub-forum on people's games if you want an idea of how it plays.