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I assume you are going to use trixbox pro and ce and the support has been canned a while back.
why not consider something like freepbx or elastix ?
as far as the cards go, you can check ebay for FXO/FXS pstn interface cards you can get away with a less than R1K for a 4 port card that uses digium drivers.
if you want to buy local check http://www.scoopdistribution.co.za/index.php/voice-over-pci-cards-c-44_67 these cards work well in elastix and freepbx and are detected by the system, so no re-compling required