well about a month ago i learned different worlds by Iron Maiden. That intro riff is amazing in my opinion. I have been looking but cant find any riffs that are like that. i like to play this riff for people because they all like the way it sounds and i dont need a whole band to make it sound good. so i was basically wondering if there are any good songs that have really good sounding riffs that are kinda fast but sound really good when you just play them alone...

Most Lamb Of God songs sound pretty kickass when played alone on guitar. Shame the same can't be said for bass. Only RATM or RHCP type artists can make solo bass sound good.

Ibanez SR506BM
Ashdown Little Giant 1000w
Peavey TVX 115+410
A big ass upright

Muse - New Born, about 1:25 in
No endeavour rivals science in its incremental progress towards a more complete understanding of the observable universe.