Sure thing, it is a big change but the Mustang was my first domestic sports car, most of my history with cars was around older M3's and Porsche's. The S550 was the first modern Mustang I could appreciate, loved the looks, 5.0 with a modern engine design and over 400hp, and a proper independent rear suspension. BUT, the suspension is really not very good for spirited driving and I got tired of waiting on decent moderately priced options from Koni and Bilstein and just decided to move on. Sure the power was wonderful but the bounce on the highway and just general poor damper/spring performance kills it in many ways for someone that's a handling junky.
I really like hot hatches and lighter cars. I've owned an 09 Fit sport that I just loved even though it lacked balls, several sub-3,000# M3's for track work, 944 turbo's, a couple of S2000's which were wonderful cars, a Mini Cooper JCW, and my favorite was a 91 318is with a 95 M3 drivetrain in it. I have more fun in smaller cars with good handling/steering/braking and in the 2,600# range.
If they sold a Fit RS in the states with about 30-40 more hp I'd probably be driving it but the next best thing was the FiST. And the car is so frickin' cheap its a no brainer.