You must remove any old kexts first and you will indeed need to reboot for new kexts to take effect - they get loaded as the machine boots. It is also a good idea to repair permissions before and after deleting/installing new kexts. This is getting off topic for this thread.
Ultimately - that depends were the fault lies. I have a basic set of Logitech H340 USB headphones that I bought for occasional VOIP use. They also get used at times when I am to lazy to go upstair to get my high quality headphones and USB DAC. Generally speaking (considering value difference) these work perfectly well with no added background noise.
Depending on your primary use for headphones - it may be better to consider a USB audio adaptor to use with your existing headphones. The Turtle Beach models are very well thought of and work out of the box. Just select it from the audio preferences and use any stereo headphones with a 3.5mm adaptor. http://www.amazon.co.uk/dp/B0036VO4X4/?tag=tonymacx86-21
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