I've been doing strong lifts 5x5 for a month and a half, but I am wondering if there is a more effective workout program that I could do, as I could workout everyday if a program called for it.

Also, my back hurts when doing squats. I'm up to 180lbs, but on the last sets my back curves out and I'm light headed on my way up. I'm 6' 3" and some people suggest not doing squats at that height.