Russ,
Nosram / LRP has the advantage of being smaller and hence a bit easier to install in a 4wd.
Novak has the advantage that their availability seems a little better and the big heatsink definately helps.
For the Nosram / LRP you need to ensure you get one marked up as 2007 spec as for a few extra bucks your getting improved reliabilty.
I originally was going to run Nosram / LRP but just couldn't get my hands on a 2007 spec at short notice so went for Novak.
I was able to shoe-horn the Novak into the Lazer (another car tight on space), with the spacers from the fan removed the speedo fits under the top deck but the other edge rubs the shell, so the fan got relocated to be nearby the speedo. If it thermals in the hotter weather I'll get a new shell and cut it 5mm up from the trim line to allow more space inside. Also you can get slim line fans. The Novak fan is poo because the blades protrude out side the body of the fan so are very vulnerable to damage. The fan is easily replaced as it terminates on a standard connector.
3 of us all ran brushless lazers, 2 Nosram / LRP (heatsink, no fans), 1 Novak (fan relocated) all on equivalent motors and the Novak came off the coolest when probed. But not a lot in it.
The only problem I suffered was the car was lacking a bit in bottom end grunt, although the newer sintered rotors are supposed to improve this.
So my advice would be...
Buy a combo deal of motor and speedo as it saves a few £££, make sure its new spec (2007spec for LRP/NOSRAM , ribbed can motor for Novak)
Buy in the UK to ensure validity of warranty.
Performance wise all systems seem very, very close, but remember you can run different manufacturers of motors with different speedos.
If you can't fit a fan on the speedo, put one in the car somewhere to ensure you have some airflow.
Make sure you have somewhere sensible to put the receiver, avoid having it very close to the motor, and if you have to put it on the top deck make sure its not over the area of the motor.
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