1996 Saturn SL2 - intermittent starting problem

Hi, I have a 1996 Saturn that's been giving me some issues lately. If anyone has any ideas as to what it could be, please let me know. I can't afford to take it to the shop right now. I am capable of just about anything as far as repairs go. Anyways, I have been having a problem with my Saturn where it clicks sometimes when I try to turn it over. It seems completely random, but this is what I have done so far to fix the issue: Checked battery and alternator at parts store, both are OK. When you tug/pull on the cable a bit from the battery (with the keys in and in the on position) you can hear the fuel pump and electrical stuff come on/off. I have changed out both terminal plugs with new ones. They are now as tight as I can get them without stripping either the bolt or the battery itself out. Initially this seemed to have fixed the problem, but it came back. I've jacked the car up and got under neath of it to check cable connections to starter, it is very tight. I wanted to swap out the battery cable for the positive side but the cables they have at the parts store doesn't seem to match the one I have. The secondary cable that goes to the fuse box is much smaller than the one in the car. I am not sure if it's safe to use such a low gauge wire. The starter doesn't /seem/ to be the issue. I am pretty sure it's a connection issue because the various terminals I have gone through have had these zapped areas on them where the terminal of the cable makes it's connection, like my socket wrench will get when I forget or don't bother to remove the negative cable and tighten/loosen the positive side and it hits the master cylindrical and sparks. The starter costs 150$ +70 core fee, and that's really something that I can't pay for at the moment. I am actually pretty broke right now! Any ideas of what might help or what I might try would be great. This thing is driving me and my wife nuts. Thanks - John Saturn starts on starter circuit but won't run in the run key position