I plan to purchase the PL 25 as soon as I can...I need a zoom to compliment it however for architectural photographs taken while travelling. I also like zooms due to their versatility. What is the 'best' choice in your eyes, that's priced at $500 or below? Or maybe I should just spend my money on a zoom first instead of the PL 25 prime? Or perhaps I should buy a wide prime instead...What highly rated wide primes are available that also falls within my budget? I plan to use my future setup for street photography, spontaneous portraiture as well as for travel. I own a GX7 but am lensless at the moment. I do have $400 already saved up, however. Thanks in advance.