I just recently traded for my 04 E-glide classic. This is my first bike with a radio system. The 40Watts does a decent job but I was thinking about upgrading. I don't have been looking at a new radio unit with XM and more amp although I don't have the cash to spring for one at this time. Any ideas if I were to go with a external amp and new set of speakers to tide me over until I can afford better. I am open to all sugestions. What would be my best choice with limited funds.