[问题求助] Tell me sth. abt NS-HSC

It is said that NetScreen-Hardware Security Client requires the use of Juniper Networks NetScreen-Security Manager to manage the device.   
I just check the datasheet of HSC and it shows me that The NetScreen-Hardware Security Client should be managed by NetScreen-Security Manager. Policy configuration cannot be done via the WebUI.

I wonder if I spend another money to buy the license of NSM, the total fund will be far more than that of 5GT.

What's the difference between 5GT/5XT and HSC?

Which appliance should I choose in remote site2site vpn connection?

Thank you for your attention.