YesZep Lick said:gtds,
It sounds like what you want is an Ibanez Tubescreamer TS-9. It has been used by countless musicians (SRV, Kenny Wayne Shepard) to get that warm and wonderful overdrive, but it still allowing the true sound of the guitar and player techniques to come through. I have the tubescreamer TS9-Dx and couldn't be happier. The only thing I woud like to do is have mine moded to be like the TS-808 from the seventies. Check out the below website. This guy, Mike, modifies new tubescreamers to be like the vintage TS-808, which is the same one SRV used. You can even buy them new in the box and already moded. He moded pedals for KWS, Scott Henderson to name a few. Read a bit about it and check out the reviews on the pedal. I have purchase a few pedals from him and he is an absolute pleasure to deal with and knows tons about vintage effects. Hope this helps.
http://www.analogman.com/
YZL