I'm just finishing up a 6 year project and I'd recommend staying away from things like changing your control arms unless you really, really need it for your application (and it sounds like you don't).
Each mod like that requires a lot of money and typically, you change one thing, and related components need to change as well. It's like a chain reaction.
There are many ways to get better handling -- bigger sway bar, different springs, new suspension parts, etc.
