Why would a 4cyl mustang be a bad idea?

[Tyrant]

I've been looking around at cars for quite some time before i buy a first car, I originally wanted a mustang but realized the insurance would be very high for a first time driver. I found out recently a kid in my school owns an 89 lx convertible w/ 4 cylinders and he said he was paying somewhere close to 1400 a year. I figured I could just get my own mustang but i'm getting alot of bad opinions about doing this.. my friends say its basicly like buying rear wheel drive ford escort. I figured i'd be able to afford insurance, i'd be using less gas then a 5.0 and i'm not exactly looking for speed. I'm just wondering if anyone has an opinion on this? I don't know why it would be a bad idea going for 4 cylinder.. i'm being told it wouldent be a "real" mustang if i had a 4 cyl.