These are the synthesizers which I currently own, listed in the order in which I bought them. 

Make / Model Year Made Price New Price Paid Bought
Marlin SX2000 1978 - 1982 £140 £140 (New) 1981/1982
Yamaha DX7IID 1987 £290 Aug 1998
Korg X5D 1994 - Present £499 £325 (New) Jan 1999

Roland D-20

1988 £160 May 2001

Yamaha CS-5

1979-1983 £139 May 2001

Casio VL-Tone VL-1

1981 - 1984

£29

£22 May 2001

Yamaha CS01

1982, (1984 MkII)

£199

£124

June 2001

Roland JX-3P

1983

£899

£150

June 2001

Yamaha CS01 in Grey/Silver

1982, (1984 MkII)

£199

£101

July 2001

Roland Juno-6

1982

£689

£256

July 2001

Casio CZ-101

1985

£395

£92

July 2001

Casio CZ-1000

1985

£122

July 2001

Korg Poly-800 MkII

1983/1984

£140

August 2001

Yamaha DX-21

1985

£100

September 2001

Korg Triton Le

2000

£250

December 2008

Waldorf Blofeld Shadow Edition

2007-Present

£309

£297 (New)

December 2013

E-mu Proteus FX

1994-?

£610

£91

January 2014

Roland U-110

1988-?

 

£46

January 2014

E-mu Orbit 9090

1996-?

£869

£72

February 2014

Yamaha MU50 XG

1995-?

£429

£50

February 2014

Arturia Microbrute

2013-

£259

£233.10 (New)

March 2014

DSI Mopho Desktop

2008-

£278

£170

March 2014

Korg Krome

2012-

£1600

£800

June 2017