AN ACR COUPE PVT PLT DSNDS TO AVOID XING TFC NEAR MIC ARPT; MN.

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I HAD REQUESTED PERMISSION FROM THE MIC (CRYSTAL) CTL TWR TO TRANSITION THEIR ATA AT 2600 FT FROM NW TO SE. PERMISSION WAS GRANTED AND I WAS ASKED TO IDENT ONCE AND THE TWR CONFIRMED MY ALT AS PER MY ALTIMETER. AS I WAS TRANSITIONING; THE TWR KEPT ME AND OTHER TFC ADVISED ONCE REFERRING TO AN 'UNKNOWN' ACFT THAT WAS PROBABLY NOT ACFT #2. THE CTLR ASKED ME TO STAY S OF RWY 32. AS I WAS JUST ABEAM OF THE CTR (ON A N/S LINE) OF THE ARPT; THE CTLR ADVISED ME OF A FLOAT PLANE AT 2200 FT AT APPROX MY 10 O'CLOCK POS. I RESPONDED THAT I HAD THAT ACFT IN SIGHT AND AT THAT TIME I ALSO NOTICED A SINGLE ENG PIPER TYPE PROP ACFT APCHING MY ACFT FROM ABOUT 11 O'CLOCK POS AND AT WHAT APPEARED TO BE MY ALT. IT SEEMED TO BE APCHING FROM SLIGHTLY E OF N. I DIVED SHARPLY AS I CONSIDERED THE VERY STRONG POSSIBILITY THAT WE WOULD SOON COLLIDE. I ADVISED THE CTLR THAT I HAD JUST 'ALMOST BEEN HIT' BY ANOTHER ACFT AND THE CTLR RESPONDED THAT 'THAT ACFT' WAS CTLED BY (THE) MINNEAPOLIS OR INTL CTLR OR BEING 'WORKED' BY 'MINNEAPOLIS.' I RETURNED TO 2600 FT MSL AND CONTINUED MY COURSE. NO OTHER DESCRIPTION OF ACFT #2.