SpiderTex,
I would agree with the other guys, in fact I do not like mixing tyres at all myself.
The tyres you refer to most likely not only have vastly different compounds but the tread patterns I believe should be made to match, in other words stick to a set.
Handling problems can ensue when you start mixing thigs up, though you will always find someone who says I used this with that and it was ok.
But that is my opinion and others may disagree.
If you want a sportier tyre how about a Michelin Pilot Power?
They steer very fast last a reasonable while (not too soft) and stick real good handle nicely but are a bit twicthy in the front.
just a suggestion.
DaveM