The Music Hall MMF Phono Pack stand alone phono preamp is what I recommend. It is a very versatile MM or MC unit with variable load settings and superb signal to noise ratio (very low noise level) that is suited to ANY quality/level of set up. Simply connect the table to it and then connect the phono preamp to an extra standard line in on your receiver/pre-amp.
BTW, how old is your existing cartridge? After many years, the inner rubber parts of the suspension dry rot and cause various problems. After more than a decade, it's usually best to go ahead and replace a cartridge.
What turntable/arm are you using?
-Chris