Number one on my list is... Jerusalem's Undead Trilogy.
This trilogy is amazing. It shows the redemptive qualities of Christs everlasting blood and gives it a sy-fy twist.
I'd also like to spread the word on Wilson's newest books:
One Step Away and Two Seconds Late
And here are several more of his amazing books:
The Best of Evil
A Shred of Truth
Dark to Mortal Eyes
And here is the link for amazon.com: