rider456 what have you been snorting mate? the steel paperclip bars that come stock on most Jap mxers are ****, and will bend like a naked gymnast the first time you tip the bike over.
Pro TAPERS, not TAPPERS, TAGs, STARbars, Renthals etc etc, made of alloy, are still a far better bar than any of the stock steelies you find in rubbish bins all over the place.
as for what frame guards to use, ones that fit a YZ85 would be a good start... Try
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Other worthwhile mods would be a pipe and muffler, assuming you are already getting the most from the stock bike, which is doubtful, and suspension modification, which will make you a far quicker rider than any power mods will... No good being a throttle jockey if the bike wont stay upright or the wheels dont stick to the ground...
and like Rider456 said, if you go with fat bars, you'll need the mounting adaptor kit...