Basically, any modern PC of Notebook/Laptop with USB2 will be able to run ActiView perfectly.
The benefits of choosing a larger screen will be that you will be able to see more detail in the signals, especially when displaying many channels (64 up to 256)
The benefits of choosing a larger disk (SDD or Harddisk) will be that you will have more space to save your recordings.
The file size of a recording of 1 hour with 64+8 channels @ 2 kHz sampling-rate is about 2 GByte.