"Receive" always fucks me up. I have trouble with my "e before i" words. I know "...except after C" but still, it's like it is instinct for me to make that mistake over and over and over again.
Also guarantee is a word I can never get right. I always spell it "gaurantee."
I was a spelling bee caliber speller when I was a kid, but then Microsoft Word and Spell Check ruined me. I am a terrible speller now.