Thanks to both of you for taking the time to help me out!

Good news to report! I've ordered my first DE razor.
I went a little razor happy and ordered two nice shaving kits:
http://www.italianbarber.com/razorock-shaving-kit-with-wilkinson-de-razorhttp://www.italianbarber.com/ultimate-head-shaving-kit?s=1As you can see, both kits take a different approach, but as headshaving seems like it's going to be a long-term commitment for me (given that my dermatologist has been less than helpful and I'm too sick and exhausted from other diseases to take time on hair anyways), I decided I wanted to really scope out my options.
I decided against trying Headblade for two main reasons: I am already using Mach 3 cartridges and still getting razor burn, so I feel that cartridges, as mentioned above, may just be too rough on my skin; and the cartridges are quite expensive for someone with such thick hair as me to be dulling out so fast. DE and/or even the Gillette Guard is much more cost-effective. Also, thus far since I started headshaving in October (knock on wood) I haven't nicked myself or cut myself. I take my time shaving, about 10-15 minutes for a complete headshave. So I think I have the patience to try a DE and HOPEFULLY not hack myself to bits. (I'll be trying the G.Guard first!).

I'm really excited about trying the RazoRock products. Especially the alum block, as I've seen alum mentioned a few times now on SBG. Of course I will let you know how it goes. I'm glad that when my new equipment comes, I will be able to retire the Mach 3 addiction, which is really hurting my budget! Even though I spent $60.00 on the DE and Gillette Guard cartridges and all the products, I feel like it was money well spent to improve my routine and save more money in the long-run.
I need to read more on the forum posts regarding DE shaving!

THANKS GUYS!!!! YOU ROCK!!!!