Aldertguitarist wrote:
What do you mean that 'The Sansamp doesn't count imho' (honest opinion) ?
Just that it's not a good amp simulator imo. Maybe for punk tones or something (I wouldn't know) but for the smooth, full saturation modern tone you're talking about (e.g. Petrucci or any modern metal) Sansamp doesn't cut it. What you're looking for is the sound of a highly overdriven modern tube pre-amp.
In general (and this doesn't help you much :-[ ), I'm with D Banks that amp modeling is the way to go. Your GT-8 probably did a much better "Mesa Dual Rectifier on 10" impression than you'll get with stompboxes and vintage amp. (If that is a vintage type amp, sounds like it is.) It probably did a perfectly usable Matchless, Twin, JCM-800 and many others too...
But back to your current situation, I'm still thinking you can get there with what you have. Try to get more distortion from the amp rather than the pedals? Nothing you didn't know already, I know. Of course then volume might become a problem... refer point re. amp modeling above! I remember playing a Boss Metal Zone through a Fender Twin and it sounded pretty cool to my ears. This was years ago though, maybe now I'll think it sounds cr*p.