Which phono section to buy: match table or cartridge?

Hi All,
I have a Rega P-25 turntable and a Clearaudio Maestro cartridge.  Both Rega and Clearaudio make phono stages.  Is there an advantage of choosing one over the other?  In other words, would if make a difference if I matched the phono stage to the turntable or to the cartridge?  I want to stay as much under $1000 as possible.  Any other sections I should consider given my gear?

Thanks in advance,Russ