I'd focus on weight, rather than aero... If you're not going to buy carbon, you're not going to get a very deep wheel no matter what you do. I have 27mm and 30mm deep aluminum wheelsets and they don't seem to provide much aero benefit. I suspect you'd need 40+mm depth which, Soul aside, puts you into carbon fiber. If you're not racing and you climb hills, you may find you get more wheel for your money by focusing on weight rather than aero.