I install solar for a living and as far I am concerned, unless you have major shade issues that keep some of the panels producing less than others, a string inverter (SMA, Fronius, Power one, etc) is your ticket. If you have the shading issues, the Enphase is good.
About roofing, a proper racking system is the same cost for a shingle roof as for a metal standing seam roof. I can install a bracket on a shingle roof in about 2 minutes and just slightly less on a standing seam metal roof and the brackets are about the same cost. I like the metal roof because it is a longer lasting roof and there is often less embodied energy in them but the decision is yours.
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