Granted, the mechanic in your shop likely has more experience on how well these components work, but I would suggest not swapping anything out until you see how the components perform. Otherwise, you may be just spending more money unnecessarily. And with brakes, I'd suggest swapping out the pads first if you're not happy with the Oval's stopping power. You'd be suprised how much of a difference good brake pads, e.g., Swiss Stop and Kool Stop, can make.