Actually your control arms do not determine how high or low your vehicle sits. Your coil springs up front do. Your arms will affect travel of the axle(limitation also based on coils too).

So, considering what you have and what you want to do, I believe(though I could be wrong) you should be able to put 4.5" coils up front and still be able to use your current control arms. Though the question is are they adjustable or not(with adjustable coils making things easier)?