Analog Compressor Reccomendation, what to buy Options

[LUCKY LUKE]

Hello

I´m working on PB G4 with Logic platinum 6. I produce electronic music and I make mastering with Yamaha Final Master. Everything would be OK if the sound would be what I ever wanted to be. I´ve heared that analog compressors are much better than softweare crap (VST,AU).
Which analog compressor should I buy. I´m thinking of getting something old on e-bay.

Thanks