Wow, I explained myself pretty vaguely there, sorry about that. About the lead channel thing, what I meant was that it is currently my only way of getting distortion and it does add a great classic rock sound. But I was hoping that a distortion/overdrive pedal, plus possibly something else (think wah, delay, reverb etc) would give me a much more metal type lead tone. I'm not too much into naming the sounds of other guitarists, as I would like to sound like me, but think Maiden, Metallica, All That Remains type thing.
Thanks for the replies so far. What I am after in a few words is:
1) A good metal type distortion pedal (was thinking of something like Blackstar HT-DistX, if anyone has one and they could let me know what they think of it that would be awesome).
2) Suggestions of any other pedals which would be considered nearly essential to a great lead tone (e.g. reverb, wah etc).
3) My budget is about £300.
Thanks for everything so far guys. I have to say this is one of the most helpful forums I have ever found.