One question, have you heard any amps so far? Also have you heard any of the speakers so far?
Not to muddy what you guys are saying about JL but have you guys and the OP heard them? Audio is very subjective, this guy could spend much more on the amp but not know the difference because he has no reference point.
My thoughts are, go with the best of what you can afford. If the JL is more affordable for you and you can't reach to the better second hand stuff atm then personally I would start with the JL. If say a year down the road you want to upgrade you got a base for what your mini currently sounds like and you can make better decisions based on actual first hand knowledge and hear the difference in sound.
My opinion is (it might not be welcome
) audio is about the journey to the best, without starting somewhere you won't know the benefits are after spending a bag of money.