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Modular if you anticipate making a lot of hardware changes...but one can use elbow grease and zipties/velcro shit to keep things tidy/maximize airflow
Find out how many watts you actually need here, then, to save money, just buy the cheapest PSU that satisfies those requirements... Then look out for deals on the premier PSU ( Corsair HX series, Seasonic ), and keep the cheapo one as a backup
For RAM, you can get away using DDR3-1333, until you familiarize yourself with the BIOS and quirks relating to that specific motherboard's design... you can find out from other builders what brand/type of RAM plays nicely with your motherboard by checking the discussion forums on the manufacturer's website
Oh, and there is no such thing as doing too much research before selecting all the components for your build











