Put a blower on the Mustang if you want more power.
Wait. You need more time behind the wheel of the Mustang and as argatoga mentioned the new Viper is coming and will take an axe to the pricing of existing ones.
It's like the newbies that get a learner bike but then get a sportbike too soon. As soon as you get the more powerful vehicle in, you'll start running it more, no matter what you claim at time of purchase. Bad things then ensue.
It is just human nature.
I disagree (somewhat) but even if that's the case, the weather will keep me in check. It's going to rain here for the next 6 months, heh.
The Oatmeal said:The 4 Seasons of Seattle Weather
(*Edit: Also applies to Vancouver, Portland, and the UK, apparently.)
Oatmeal comic
Wait until the new Viper arrives, accumulate money and experience during that time.
Those are some pretty weak rationalizations. But don't be paralyzed by analysis. Just buy one. If you wait for conditions to be perfect the time will never arrive.
Enough talk. Do.
is an old RT/10 a possibility? Its still crazy fast and looks amazing.