GSM setup recommendations

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Hello list,
We are interested in configuring an Asterisk based GSM server in Africa
an I would like your recommendations. The requirements are:
1) A system with at least 8 GSM cards
2) 2 pstn lines from here (the US) will directly link with 2 lines on
the GSM server and the rest of the U.S. users will be routed to the
remaining GSM lines based on availability.
3) Web interface will also be needed for calls and text messages
Based on these requirements, what do you guys recommend?
Server computer type? GSM Cards? Asterisk version? Setup scenario? *

Thanks in advance for your help.