for me ive gone a few different strings:
1) dadarrio XL $5.5
+ve : cheap, nice couloured ball ends
-ve : bad chemistry with mi
2) ernie ball super slinky $5.5
+ve : cheap
-ve :bad chemistry with mi
3) SIT power steel $5.5
+ve: cheap, really Stays-In-Tune really well with mi licensed floyd and whammy tricks even steve vai'd be scared of
-ve: bad chemistry with mi, stainless steel tone leaves much to be desired
4) kurt mangan nickel $5.5
+ve: cheap, playability is constant, good chemistry wid me
-ve: none so far
5) kurt mangan steel $5.5
+ve: cheap
-ve: bad chemistry, stainless steel tone
6) fender (clearing stock at luthermusic and g77 $3.5)
+ve: reall dirt cheap, treble strings stay shiny and smooth to play for months
-ve: i've bought 2 packs so far, where im tuning up, the ball end will get unwound and the string "snaps"
7) DR coated $18
+ve: really nice feel to play with, good chemistry(or none at all), hard to rust
-ve: for ppl like me who fret quite hard, the coating wears off at the frets really fast, and also it costs a bomb compared to other strings, at $18, its a luxury
well, thats how it is for me, currently using the kurt mangans