Its easy to rave about the car, but when it is your hard earned money that you are throwing down, I bet you will cross shop other cars for 43k.
Hell a 2007 Audi RS4 Certified Pre Owned with around 20k miles can be had for low 40k.
You can also get a 1 year old S4, M3, New 335, new G8 with 10k in your pocket, G8 GXP, 1 year old CTS-V etc. All will DESTROY the new SHO in ALL categories.
No way I will spend more than 30k on anything american besides the Corvette and the CTS-V.