Doing it right the first time is the best way. That's why I did what I did.
The vf52 was done last Aug, it was $1030 I think. It came from Mike at AZPinstalls.com. You will need a tune with it, I'm sure he can get a vf46 also.
Your tranny should be fine.
3 weeks ago, the car should be covered under the 30 day warranty.
174,000+ miles, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. Also CHECK YOUR OIL, these cars use it.