You should know that ANY aas can have a negative effect of your natty test levels. Granted Var, may not have as mucho of a pronouced effect as others but there is a possability, and best practice would say to run a mild(er) PCT regime afterwards.
Given your goals I think you're best options would be var or primo. I'd run the var in teh 30-40mg/day range for 6-8 weeks; include some type of liver detox @ the end of the cycle.
Primo can be tought to find, and $$ but If you added 400-600mg of it a week w/the var you'd be golden.