Just found a Consumer Reports June 2014 review of sunscreens.
FWIW, here are the top two rated sunscreens reviewed by category:

Lotions:
Coppertone Water Babies SPF 50, Price $11.00, Cost per oz. $1.38, Overall Score: 81
https://www.amazon.com/Coppertone-Water ... B0012AOMEW

Equate (Walmart) Ultra Protection SPF 50, Price $9.00, Cost per oz. $0.56, Overall Score: 80
https://www.walmart.com/ip/Equate-Ultra ... z/14122653

Sprays:

BullFrog WaterArmour Sport InstaCool SPF 50+, Price $10.00, Cost per oz. $1.67, Overall Score: 95
https://www.amazon.com/Bullfrog-Suncree ... 0TYJO?th=1

Up & Up (Target) Sport SPF 50
http://www.target.com/p/sport-sunscreen ... A-13967209


Ultra High SPF:

Banana Boat Ultra Defense Max Skin Protech SPF 110 (spray), Price $10.50, Cost per oz. $1.75, Overall Score: 99
Looks like the product may be discontinued, this might be the replacement product:
Banana Boat Sunscreen UltraMist Sport Performance Broad Spectrum Sun Care Sunscreen Spray - SPF 100, 6 Ounce
https://www.amazon.com/Banana-Boat-Suns ... DTCOQ?th=1

Neutrogena Ultimate Sport SPF 70+ (lotion), Price $11.00, Cost per oz. $2.75, Overall Score: 93
https://www.amazon.com/Neutrogena-Ultim ... B001P99QZU

Update: also this SP discussion:
Best Sunblock/Sunscreen for Climbing?
best-sunblock-sunscreen-for-climbing-t62258.html

Possibly useful thread over at Mountain Project..
Do you wear hat under climbing helmet?
https://www.mountainproject.com/forum/t ... ing-helmet

Jesus Malverde wrote:Buckie,
Here's one extreme option: a type of face mask that was used on K2 in 1979. Not sure if was ever commercially produced, but you might construct something of your own or modify some type of existing mask of some sort. Just some thoughts for battling The Lord of Light.

You beat me to it. I did a research project in junior high on expeditions to K2. I recall the mask is a foam backed with reflective aluminum skin.

Another alternative may be a sun gaiter designed for fishing. Something like http://www.cabelas.com/product/SIMMS-SUN-GAITER/2054711.uts?productVariantId=4916838&WT.tsrc=PPC&WT.mc_id=GoogleProductAds&WT.z_mc_id1=04631663&rid=20&gclid=CK7BnJ7y99QCFVUvgQod1kIOcA&gclsrc=aw.ds