I have a cheapo Squier P-Bass, and wish to cause minor earthquakes with it. I regularly tune down to CGCF, but I am not happy with the sound on my current .45-.100 set. There is nasty nasty nasty rattle. What guage should I use to improve my results, and where can I obtain heavy guage strings without breaking my bank (keeping in mind that I could only afford a Squier). On a related note, I am willing, if slightly reluctant, to sacrifice my G-string. Is it possible to use the lower 4 strings of a 5 string set on my bass? If so, what if any modifications are necessary?