If you're looking for a superbly built IEM with a reference baseline beautifully spiced with a subtle touch of organic that you can adjust with the flick of a switch, then the SA6 holds fantastic value for the price and will be tough to beat! It packs impressive resolution and a remarkable tonal accuracy across the range. A very engaging reference IEM, that follows in the footstep of hallmark IEMs such as the InEar Prophile 8 at a fraction of the price.
If you're looking for an engaging entry level reference IEM with solid technical foundations and an emphasis on vocals, along with good sub bass extension and rumble then the SA3 should definitely be on your list! If you want a more organic take and can afford mid tier pricing then check out the SA6.
If you're looking for a budget IEM that packs excellent and punchy bass, smooth mids and energetic treble with good sparkle and shimmer the TFZ No3 19th is quite the engaging listen and impressive performer at the price granted you feed it appropriate power which out of DAPs will mean reaching for a balanced cable.
If you're looking for a relaxing yet fun IEM with very good bass slam, full bodied mids with good upper mids bite then the TFZ My Love III deserves your consideration. If you have a decently powerful source like the DX160 or Lotoo PAW S1, running the My Love III balanced shows that its graphene driver will scale up nicely to take it several notches up.