H/C 400RWHP LT1 dyno or mail in tuning???

I need a good tuning for my Trans am!!! Mail in order tuning will cost me less than $100 (from Ion) and for the dyno tuning I will have to pay $550.
I can spend that $450 difference to purchase new suspension or other parts, and just get the mail tune, but I don’t know if mail tune is good for my car.
What do you guys think???

Here are the mods:
GTP Stage II Heads
Comp Cams XE 224/230 Cam
Crane Gold Race 1.6 ratio rockers
Trickflow chromemoly pushrods
AS&M 52mm throttle body
K&N FIPK CAI
FMS 42lb/hr injectors
MSD BTM Ignition
MAC shorty headers <-no secondary air injection, keep in mind emissions guys
ORP <-no cat, keep in mind emissions guys
Flowmaster catback with DMH cut-out

Sebastian

Not to bash your car/mods in anyway, but I think your injectors are overkill, unless your going to spray it later on..30#'s would be fine...That cam is somewhat popular, so Id think he would be able to tune that pretty close..If there was a way you could get a few datalogs, that would help him get that tune, that much closer..Just my $.02