Man, you guys are brainwashed.

$8-10K? you can get a Vortech head unit (blower itself) for ~$1200-$1500 new (more for the larger ones)- much less used, fab the brackets (easy with the right tools), get the ECU flashed (not for the $1k that Renntech gets either) and run 6-7 psi on the STOCK motor. 10:1 isn't beyond boosting. If you want more boost than that, you can get thicker copper head gaskets made (a few places do this custom) to drop the compression to ~9:1, intercool it and run around 14-16 psi (with the right blower). 10K would put you in the 9's if you do your own work lol.
I drove an SRT6 yesterday,not worth the $45k to me. My car with the 125 shot walked all over it (yes, we had to find out).

It was nice for stock, don't get me wrong- but $45k? I paid $25k for my 04, and $400 for the kit (got it from a buddy used) and I took the SRT by about 2 1/2- 3 cars (straight line). Once I boost it, I will have the same performance all the time, not just on the button. As for internals, I wouldn't use any of the Mercedes stuff if I were to boost it personally, rods and pistons aren't that bad to get custom made and will be much stronger than the Mercedes stuff.
As for paying for an actual motor swap- if I were to go that route, it will have to be an LS1.

I already told the wife, the day this thing nukes is the day I buy an LS1 for it. I thought about the Hemi, but the LS1 is lighter motor and would be better suited for this car. Plus- with the aftermarket for that motor, 700+ hp is just a walk in the park.
Joe