Hi there,
Right, i will list model all the options for you comparing the TDI's arcoss the range.
NOTE -- I would suggest you keep away from the diesel SDI which is non turbo, very slow at around 73bhp with a 0-60 time of about ten minutes.

-- its around 16.2 s.
S Range -
1.9 S TDI 3d
1.9 S TDI 3d (AC)
1.9 S TDI 5d
1.9 S TDI 5d (AC)
1.9 S TDI 5d (DPF) (AC)
2.0 S SDI 3d
2.0 S SDI 3d (AC)
2.0 S SDI 5d
2.0 S SDI 5d (AC) - Avoid the SDI -
BlueMotion S
Includes the same equipment as S1.9 BlueMotion S TDI 3d (DPF)
1.9 BlueMotion S TDI 5d (DPF)
Sport
Includes the same equipment as BlueMotion S,
plus:-
Alarm
Alloy wheels
Lumbar support
Sports seats
1.9 Sport TDI 3d
1.9 Sport TDI 5d
1.9 Sport TDI 5d DSG
2.0 Sport TDI 3d
2.0 Sport TDI 5d
2.0 Sport TDI DPF 5d
2.0 Sport TDI 4MOTION 5d
2.0 Sport TDI 5d DSG
2.0 Sport TDI DPF 5d DSG
SE
Includes the same equipment as Sport,
plus
Cruise control
Rear electric windows * (EXTRA)
l
oses
Sports seats
1.9 SE TDI 3d
1.9 SE TDI 5d
1.9 SE TDI 5d DSG
GT
Includes the same equipment as SE,
plus
Front fog lights
Sports seats
loses
Cruise control
2.0 GT TDI 3d
2.0 GT TDI 4MOTION 3d
2.0 GT TDI 5d
2.0 GT TDI DPF 5d
2.0 GT TDI 4MOTION 5d
2.0 GT TDI 5d DSG
2.0 GT TDI DPF 5d DSG
2.0 GT TDI (170ps) 3d
2.0 GT TDI (170ps) 5d
2.0 GT TDI (170ps) 5d DSG
GT Sport
Includes the same equipment as GT
2.0 GT Sport TDI 3d
2.0 GT Sport TDI 5d
2.0 GT Sport TDI DPF 5d
2.0 GT Sport TDI 5d DSG
2.0 GT Sport TDI DPF 5d DSG
2.0 GT Sport TDI DPF (170ps) 3d
2.0 GT Sport TDI DPF (170ps) 5d
2.0 GT Sport TDI DPF (170ps) 5d DSG
Match
Includes the same equipment as GT Sport,
plus
Audio remote
Cruise control
loses
Front fog lights
Sports seats
1.9 Match TDI 5d
1.9 Match TDI 5d (DPF)
1.9 Match TDI 5d DSG
1.9 Match TDI DPF (7) 5d DSG
So not many to chose from really!!
Couple of things to add, the S range tend to come on wheel trims rather than alloys.
SE -- have black external door running strips and on front bumper until around 2007 -
GT SPORT has the new front end (black grill)
Rick