Hell, if you want to impress some morons, get an old Jag V-12 or Ferrari V-12. At least they look impressive as all hell. V12's have a sound that V10 will never get, and be WAY more impressive to the idiots. Of course, if you really wanted something different, get an old GMC inline six. You can make in excess of 1200hp on that block, day in, and day out, and it will keep running, be unique, and definately get some looks from the morons...