Ultrasound equipment for obstetric gynecology: wich one to choose?

Ultrasound equipment for obstetric gynecology: wich one to choose?

Hi there,

My brother in law is about to buy an ultrasound equipment but he has
some difficulty to choose. Here's the list:

Mindray DP9900
Aloka DS1100
Siemens Sonoline G20
Toshiba (some cheap model)

Any advice please?

Thanks in advance for any information.

Abdel.