I've never been a big fan of peanut butter, so I may not be the best person to answer this!
Personally, I love almond butter. I don't really like sunflower seed butter, but I've never tried the version with sugar in it. You can get it sugar free, but it's more expensive that way (go figure!).
Another option for you might be hazelnut butter. JUST hazelnuts, no cocoa or sugar in it like the addictive Nutella! The plain hazelnut butter is really good with my sugar free 'jam', so I'm betting it would be delicious with jelly on bread or toast (a combo I have not tried). Hazelnuts are very good for you...better than almonds, actually as they have a better omega 3 to omega 6 ratio.
What I wonder is why you don't see pecan butter anywhere? I love pecans because they have a slightly sweet taste naturally. If they weren't so damn expensive, I might consider trying to make my own pecan butter to see if it works.