This is just my opinion, but i would go for the Honda hands down. There is lots of potential and long term reliabilty plus is already handles and brakes well from the factory.
5 years down the road the Honda will still feel tight and run well plus hold it's value.
I'm not saying don't get a Mustang, but I wouldn't buy one for half the price of the Si.
__________________
www.lhtperformance.net.
727 344 1800
*Turbocharging* Engine building* Tuning *Intercooler piping*exhausts* headers* clutches ,fabrication and much more
13 years in the same location.
** HONDATA Authorized Dealer+ Tuner **
01 Type R-647whp street car w' AC - Cover of turbo magazine Feb 2008
01 K20a INSIGHT - Cover of Honda Tuning magazine June 2008
2011 KR-Z K20 powered CR-Z -Cover of Honda Tuning magazine April 2011