Thanks for the replies everyone. I will try to address them the best I can.
Chuck47h: After we started having seepage problems, we regraded the yard behind the house to better define the swale and redirect the water away from the house. We still have the seepage problem, so either we didn't slope it enough or there is another problem.
1) Unfortunately, anything on the exterior of the foundation wall is a mystery to us b/c we bought the house after it was already built. So, we're not sure what kind of waterproofing was used. Interestingly enough, another house built by the same builder has hired a basement dewatering company to fix their problem at the cost of $10,000.
2) Second, we do have a septic bed, but it is located on the front of the house where we don't have seepage problems.
3) We're unsure if water pours in the footer drain at the sump pump well. We've "snaked" the footer drain piping and didn't find any obstructions, however the snake did come out with sediment covering it. There is also sediment laying in the footer drain pipe at the opening in the sump pump well.
4) I'm not sure what weeping tile is, but if its on the exterior of the house we won't know until we dig it up. I am interested on your thoughts about the weeping tile, though.
We are do-it-yourselfers and would like to exhaust all avenues before resorting to digging up the foundation wall if at all possible.
Thanks again for your replies!