It is very much a personal taste and based on my own experience.
Please be gentle and don't just tell me to go buy an Exige S

Here is what I would love to be able to do if funds were available.
Stripped NC - Goal weight 950 kgs (remove everything except dash)
Seam welded & FIA approved 16 point chromolly roll cage (to front strut towers)
2.0 head with 2.5 bottom end
Forged 9.0:1 CR Pistons and Rods
Custom steam pipe exhaust manifold
HKS GT2835 Pro
Custom 50mm Alloy Radiator
Custom Intercooler & piping
3" straight through exhaust with a droopy tip

MoTec M800
SARD 750/850cc injectors.
Malpassi Fuel Pressure Regulator
Bosch 044 In line Fuel Pump
External fuel surge tank
Twin plate clutch (someone has to make one for the NC)
AP Racing 4 piston callipers front on custom brackets
AP Racing 2 piston callipers rear on custom brackets
AP Racing Master brake cylinder & reservoir
AP Racing 310mm slotted & vented disc rotors mounted on custom floating alloy hats
AP Brake Proportioning valve
Steel braided lines
Ohlins DFV Externally Cooled Fully Adjustable Damper & Height Coilovers
Cusco 2 Way Type RS LSD
RP-F1 18x9.5 (offset to clear the brakes)
Kumho 285/30/18 slicks
Carbon Kevlar Sparcos/Recaros (which ever is lighter)
Sparco FIA 6 point harnesses
Fire extinguisher
I'm sure I missed a few things so I'll come back and add or modify things as this thread progresses.
Remember be gentle people, my dream is easily destroyed

*edit*
LSD added