J_B, be careful with an SPF4. It sounds a little dangerous. The lowest I go is a 15, and that's only if I don't plan on being out for an extended period of time.
Tyler, I've used the Alba shave cream in a squeeze tube and wasn't impressed with it for my head (not really a smooth shave like Headslick), or my face for that matter. But everyone is different as to what works best, and the Alba was only 4-5 bucks at Whole Foods Market, so I didn't feel like I wasted too much money seeing how it worked. You mentioned shave gel, so I don't know if that's something different from what I tried. I didn't see anything called 'gel' on their site.