Im sure this has been debated several times, could I please ask for any links or appropriate thoughts
Performance-wise, the RT won't hold a candle to the 2005 GTO. I don't know what the 2005's will run, but the 2004 in this link
ran a 13.11 in good weather and 13.40 in the middle of summer. With 50 more ponies, the 2005 GTO should be running 12's bone stock.
Here's the C&D link
for the mustang and GTO comparo. The C&D quarter mile time may seem a little off until you realize that C&D does their testing on the west coast where 2500 ft density altitude is normal; at the same track as GMHTP (Englishtown, NJ) the car would have run 13.0 or possibly 12.9 even in the heat.
Only the SRT8 has a chance of beating the GTO. The HP to weight ratios are very similar: the GTO weighs 3900 lbs and has 400 hp for 9.75 lb per hp, and the SRT8 has 425 hp for 4100 lbs, for 9.65 lb per hp. Drag strip runs will be a tossup. Looking at the June 2005 C&D, the 300C SRT8 ran a 13.2 at 109, while earlier the 2005 GTO ran 13.3 @ 107. Because we don't know what the weather was like on each test day, and thus we don't know the density altitude, we can't really predict who would win head-to-head.
Skidpad numbers are nearly identical, and even the 70-0 braking is within a couple of feet. Where the GTO will win is on price - assuming the pricing difference between the 300C SRT8 and the Charger SRT8 stays the same as the RT models, the Charger will probably run around $37,300 MSRP, $4k more than the GTO. (I wish I could get the SRT8 performance options in a plain-jane Charger instead of having to fork out for options I don't even want.) On the other hand, the Charger wins hand-down on looks. I just couldn't bring myself to buy a GTO - they ruined that car when they slapped a Pontiac nose on it. The Charger, on the other hand, is as good-looking as my 96 impala and has the cojones to back it up. I just wish I could order it with a hood scoop delete and steel wheels, or else have a selection of wheels to be dealer-installed.