I need a decent challenge. Something bluesy, rock n roll (so no shred, metal, country or bluegrass etc) that'll strecth my abilities. I can play Hey Joe, Voodoo Chile, Layla, Purple Haze, Wind Cries Mary, Nothing Else Matters, (these are all songs i learnt recently) but i nailed them all in one night. I need something more challenging, but not impossible (and its gotta be tabbed well)

Maybe try "Pride and Joy" by Stevie Ray Vaughan. Its pretty difficult, but even just the intro part is very satisfying when you get it down.
since ive been loving you - led zeppelin

One of their best songs i reckon. The intro is pretty cruisy but the solo is great.
Since ive been loving you is amazingkly hard, ive tried and still cant get it

i figure Achilles Last Stand. thats one of my favorites songs to play, and its 10 minutes long, so it may take a few days
does it matter if i play guitar? yes.