Replying to Line masterminds or chronics?

So..

after searching and reading many reviews i have set myself between the chronics and the masterminds

the truth is that i am looking for a cheap freestyle ski for everyday in the park and resort

i want the ski to ski similar to my JJ's

however i have to make the rightest choice

i am 5.7 and 145lbs and i am not a jibber at all but i do some grabs 360s etc but on the other hand i would like to improve my jibbing skills

the two choices i have at this moment are

173 line chronic (but will the 173 platform give me enough ski?i skied a 171 atomic access one time and felt like small and had no tail at all)

177 masterminds which seem to be allright for park and improving my skills but...

help me out please!:)