I have a system 1 right now and it is very forgiving and quiet. I have the pro tune on mine and it puts the brace height out to 8.25 inches and it makes a great hunting bow. I have shot 8 differant brands of bows in the last 8 years and I went to css because I have never seen one go back to the shop for anything other than strings and cables from my experience they are trouble free.
For the speed you want I agree the challenger would be a good choice that will be my next CSS. If you go to fastestbows.com they have reviews on the swampmaster and the challenger and it makes for very good reading.
If you give them a try I think you will be very pleased I know that I am with mine.
I hope that I helped good luck!
cebpa <><