You say you had your ISP check the thing......

Did they send  a tech out to check the line?  And if so, did they check the line 
right there where it plugs into your modem or did they check it where the phone line 
goes into the "NID" (network interface device), the box on the back of your house 
that your house phone wiring plugs into.

If they did not check the connection from within your home, get a good quality (not 
dollar store) phone extension line, run it from the NID to the modem, and recheck. 
 Could be the DSL signal is being affected by bad wiring in your home.  Using the 
extension line will bypass inside wiring.  If the thing consistently runs right with 
this extension rig, then your house wiring is bad.

Another thing to check---are your DSL hi-pass filters installed on ALL phone jacks 
EXCEPT the jack that feeds the modem?  Your modem MUST have an unfiltered direct 
connection to the line carrying the DSL signal.  Get rid of splitters, answering 
machines, fax machines, or other contraptions and test again.  Also, I have seen 
it where DSL speeds have been hampered even though a jack has nothing plugged into 
it and for some reason when a filter is plugged in, even though nothing is plugged 
into the filter, it makes the speed better.  Weird.

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