iperf is a free utility that might help you test you line. It allows you to dynamicaly change Windows/Buffer sizes and shuchm but it will just show you that yes you can infact get 6MB out of the line and help your applications perform better over the WAN.
There really isn't much you can do abuot latency, and YES latency will drastically effect your performance (especially for fat client software like SQL). A larger pipe (100MBs) will help your situation some, beause the system can shove more data thru per send, but it may not make it perfect...
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