What did you have before, and what did you think of the sound of that cartridge? Do you have any issues with other sources (CD, iPod, etc.)? I am wondering if you are certain that your issues lie entirely with the cartridge and not some other part of the system.
Also, if you are migrating to headphones, you might want to hold off on any changes until you get the phones. I have Stax 007 Omega II Mk.1 phones. These can be just a touch bright and a little thin in the upper bass/lower midrange. It might be the case that your current cartridge would work with that kind of balance. I have heard that the SR-009 is even brighter sounding than the 007. I use a Blue Hawaii Special Edition amp with my phones.
Also, if you are migrating to headphones, you might want to hold off on any changes until you get the phones. I have Stax 007 Omega II Mk.1 phones. These can be just a touch bright and a little thin in the upper bass/lower midrange. It might be the case that your current cartridge would work with that kind of balance. I have heard that the SR-009 is even brighter sounding than the 007. I use a Blue Hawaii Special Edition amp with my phones.