As for what I use, I'm currently loving the HB Sport with the HB triple blade cartridges. I should be getting the ATX with some 6-blades in the mail today though (YAY 20% off!), so I'll have to get back to you on that one. Just remember with the Sport NO PRESSURE ON THE BLADES!!!!!! If you do, you'll swear you shaved off your skin

. Also take your time if you can. Nearly every time I try to get it done quick, I pay the price.
Here's my current routine:
Hop into a hot shower, get head wet, (every now and then I scrub here with Nutrogena acne was (the orange pump bottle stuff), but I only do this once every 3 days or so) apply 2-in-1 shampoo and don't rinse untill done with shower, pat dry, apply preshave (I use Lectric Shave, can't beat the closeness but it has an intense warming sensation that I would avoid if I had a sensitive scalp) and work it in against the grain, apply shaving cream against the grain (I'm weird, I like Gillette Foamy menthol (cheap canned stuff)), shave against the grain, rinse with warm water to clean off the shaving cream, rinse with cold water to close pores and combat irritation, slap on some HB HeadLube (I use the one with SPF 30, gives it a nice shine that won't blind people), go outside and feel the nice, cool morning breeze on my smooth dome.
After about 30 minutes or so I reapply the HeadLube to the back of my head (for whatever reason the back of my head really soaks it up, the sides and top not so). I also take a fish oil pill because it really helps my skin out in the dry winter months, so I figure it helps with a dry scalp.
I have yet to have irritation in a week using this, but as always YMMV as all scalps are as unique as fingerprints.