grump- I would highly suggest reconsidering and looking at the Speemerchant Rev. 3, it is very similar to the CRC knife, however there are a few distinct features that make it a much better car.
-Adjustable battery position (huge in 12th scale)
-Adjustable and smooth side links
-stiff chassis (the crc flexes alot in the rear)
-low roll centers (the crc ones are sky high and to make the car handle considerably better you have to install speedmerchant side links, which have adjustable roll centers)
-Old style front end, its much simplier and its still the hookup for stock, espically for people just getting into 12th scale. the dyanmic strut from end is very poorly molded and requires alot of handfitting to work properly.
Also I would suggest a Monster stock motor, they are the best for any track hands down.
I have not had any expeariances with GM speedo's so I cannot comment, however I will say I have yet to be dispointed with an LRP quantom comp
As far as servo's each company basically makes a servo for 12th scale. All of them are pretty good, I personally run airtonics, however I have seen some bad batches of them from time to time, however I still go back to em, lol. Futaba and KO Propo are the other choices that I have heard good things about (the KO servo is wicked fast though, and I have heard its to the point where its detrimental, even for certain not to be named A main mod 12th scale drivers, lol)
if you have any questions please feel free to ask!