Deet on any exposed skin, and permethrin on clothing and gear. Deet strength depends where I am, and what I'm doing. If I'm going up the the UP in summer, it's 100% deet every time. Just depends how bad the skeeters are wherever I am, but in general I'll go with the lowest concentration that does the job.
Side note about 100% deet; do not get it on anything nylon, it will melt it.