There was already a simliar thread like this. http://forum.mikrotik.com/t/number-of-concurent-sessions-for-power-router-2242/40209/1
Just purchase an Axiomtek NA-820. Its the same thing as the PowerRouter 732, MikroNOC 2200, MikroCore 7, Roc-Box and other rebranded products.
I provided another user with a distributor in the US who could sell you the system. http://forum.mikrotik.com/t/routeros-with-axiomtek-na-820-lcd/32725/6
Despite what anyone says, these boxes are all the same! The only difference between any of the products above is the reseller you purchase it from. You’re paying for their support, their varying levels of MikroTik / network expertise…not their own ‘secret sauce.’ But, don’t just take my word for it…
http://www.mail-archive.com/wireless@wispa.org/msg50156.html
http://www.mail-archive.com/wireless@wispa.org/msg50141.html
Even if you purchase a PowerRouter from LinkTechs, they’re don’t seem to be as stable as they claim.
Quoted from http://forum.mikrotik.com/t/number-of-concurent-sessions-for-power-router-2242/40209/10
“Stable PowerRouters” 
http://forum.mikrotik.com/t/power-router-crashing-and-rebooting/40397/1
http://forum.mikrotik.com/t/power-router-732-spontanious-rebooting/38247/1
http://forum.mikrotik.com/t/unexpected-rebooting-x86/39731/1
http://forum.mikrotik.com/t/mpls-on-multiples-interfaces-extrange-problem/36381/1
http://forum.mikrotik.com/t/multicast-bridge-mikrotik/35263/6
http://forum.mikrotik.com/t/rb1000-closing-tens-of-pppoe-connections-at-once/33500/23
http://forum.mikrotik.com/t/rb1000-closing-tens-of-pppoe-connections-at-once/33500/13
Common denominator…the OS. They’re no more stable the OS that runs them, RouterOS.
Also, a bit odd these people are asking for community support instead receiving support from their vendor…