Shock questions

I want to put shocks on my Dart. I have factory style shocks now that are pretty weak. As usual, I plan to upgrade. I have been looking at QA1 for a while and ran into Viking Performance at Car Craft last weekend. Apparently the brothers at QA1 had a split and one started Viking Performance. The shocks are almost identical but Viking's are considerably cheaper. My brother brought up a good point, though. My Caltracs need the rear to squat to do their job. If i get a stiffer shock, even if they are adjustable, will I give up the traction of the Caltracs? Any other suggestions for shocks?