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I have since ditched DSC and gone the old school route with a merkur safety razor and a brush. I won't be going back. Sure it takes a bit more time, and you nick yourself every now and then, but the shave is better and your skin will thank you.
AoS has good stuff, but it is way overpriced. That, and you can easily make your own shaving oil if you care to. I started with AoS but am currently using Proraso stuff. Price and the fact that it's Italian and readily available here are added bonuses. YMMV.
In my experience instead of spending the premium for pre-shave cream, just use Noxzema. Pretty much the same stuff. However I use Proraso for my aftershave splash and lotion.
Sephora (largely a make=up store) has an AOS sample kit every year at Christmas, or at least they've had it the last 2 years. Small brush, shaving cream, oil, and some other product (all sample sizes), for $10. It's a great deal. If you like the AoS stuff, check out Sephora come late November and see if they have it again this year.
I went to the Dorco website by following the link and the blades were not that much cheaper. A six month suppy for $31 compared to DSC price of $36. I guess maybe Dorco raised their prices recently?