For MEDIUM AOS drones:
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Emax ECO II 2004
The Emax ECO II is a solid mid range motor at an exceptionally low price point. These 2004 motors provide comparable power and efficiency to motors costing twice as much. They are well matched to a 5" biblade, a 4" triblade, or 3.5" bullnose prop.
T-Motor F2004 1700KV/3000KV Motor
It's hard not to recommend a T-motor product when one exists in the right size and KV for your application. The F2004 1700Kv is well matched to a 6S ultralight 5" setup. The 3000KV is better for 3.5 - 4" setups on 4S.
FC + ESC
JHEMCU GHF405 Pro AIO - F4 FC + 25A 3-6S BLHeli_S ESC
For smaller drones this 25A rated AIO is a great choice at a great price point. 4K PID loop is recommended for F4 processors with MPU gyros. Flash BlueJay to the ESC to support bidirectional Dshot.
Flywoo GOKU GN405S AIO - F405 BMI 270 FC + 40A BLHeli_S ESC
Flywoo make fully featured flight controllers at a sensible price point. You don't need more than an F405 processor to run the BMI 270 gyro (3.2K PID loop rate) and the BMI270 at 3.2K performs better than MPU6000 at 8K for Betaflight. Flash BlueJay to the ESC and you are good to go!
iFlight Beast F7 V2 55A AIO 25.5x25.5 mm Flight Controller
Drones smaller than 5" should prioritise a 25mm AIO for ease of build and weight. This iFlight Beast F7 AIO has a 55A rating (more than enough for any drone with smaller than 5" props. It also has all the connections and functionality you could want on a Betaflight flight controller. A premium offering from iFlight but not the cheapest option available.
XILO 850mAh 6s 100c Lipo Battery
850mAh on 6S is a good size for 5" Ultralights. A 100C rating is typically designed for flight applications. Anything less than 50C is for ground vehicles. Battery availability depends on where you live and who will ship LiPos to you. This is a good value option from XILO.