Ur budget is a bit low but I will try:
Decent head unit with 3 RCA out: 8K to 10K
Components Pioneer TS-D1720c: 11K to 12K
SQ amp, I have some if u r interested in used stuff: 6K to 9K
Subwoofer JBL GT5: I think 4K to 6K (Need confirmation)
Box and wiring: 3K
I tried but couldn't get it below 32K