Here is my list for under $15K like Sean set out.
#1 2003 Ford Mustang Mach1
#2 1999-20003 Ford F250 Super Duty (Diesel): 500 ft/lbs at just above idle, oh yeah
#3 Toyota Supra: bet a lot of you did not see that coming, always liked these
#4 Jeep Rubicon: for when mud or rock crawling is required. Would have rather had a 70's Ford Broco but Sean told me that would porbably be more than $15K
#5 Suzuki Hayabusa: gotta have a bike right?