I have a 1987 Buick Regal (2 dr) that I want to put Polk speakers into. Unfortunately, an NHRA-required roll bar that went through the factory speaker holes. This was no big loss since they were 4 X 10s. Any suggestions for speakers and placement? Money is an object, but I believe I can afford whatever Polk products would be suggested. I presently have a 60W per channel Blaupunkt amp, but an upgrade is certainly possible since it is 14 years old.